LPBUG 756966 is solved.

All failing cases were attempts to use connection after
the server was brought down and restarted. Connections 
used client reconnect option.

The reason for failures is the behavior of sockets on Windows:
for a short period after crash (short enough to make the error 
not reproducible under debugger), write to socket on client
side would succeed but subsequent read would fail. 

MYSQL_OPT_RECONNECT does not really help in this case ,
because  in the case given here ,as  mysql_real_query() 
(which can handle reconnect option)  succeeds and 
mysql_read_results() (can't handle reconnect) fails.

The fix is adding --include wait_until_connected_again.inc to 
appropriate places in test. This ensures that read errors are 
caught and connection is recreated.

Fixed problem that fill_record() allocated memory for every call. This could be a problem when doing big unions as memory could be filled up.

sql/sql_base.cc:
  Don't allocate memory in fill_record().
  Fix was to remove the list of tables. This was not necessary as this call is only used with one table.

Parameter setting has the effect on 4th part of the version string in executable's version info on Windows.
It could be set e.g to bzr revno to uniquely identify  different builds for the same major.minor.patch combo.

add a read-only server variable @@myisam_block_size

Use MYSQL_INSTALL_TARGETS() macro for DLLs 
(libmysql and libmysqld) to ensure that libraries
are signed, if signing is requested.

Remove SIGNCODE_ENABLED variable from create_msi.cmake.in,
it was already removed from other places.

mysql-test/mysql-test-run.pl:
  Don't set --log-error when running embedded server as we don't want the mysqltest output into mysqld.1.err
sql/mysqld.cc:
  Allow one to disable --log-error

- FIND_PROGRAM (signtool) will now get a hint about location of signtool.exe (Windows SDK)
- Targets "package" or "msi" will now fail, l if signing is requested but does not work
  (e.g invalid certificate)
- During install, do not re-sign binaries, if they are already signed.
- Preserve mysqld_error.h timestamp whenever possible. This helps avoiding situations 
where the whole server is rebuilt, whenever comp_err.exe changes (for example after code 
signing, or also after a minor fix in mysys)
- Fix Wix error in UpgradeVersion, if patch part of the version is 0.

Changed test suite to use --log-basename (to get the code tested)
Added --sync-sys=1 to test suite to speed it up.
Better error messages if something goes wrong with mysql_install_db


mysql-test/Makefile.am:
  Removed not existing directory
mysql-test/lib/My/ConfigFactory.pm:
  Use log-basename
  We had to also set 'log_error' as some test was explicitely using the old name
  Added 'sync-sys=1' to speed up test suite
mysql-test/r/variables-notembedded.result:
  Updated test results (variable relay_log is now set)
mysql-test/suite/binlog/t/binlog_delete_and_flush_index-master.opt:
  Force specific names for some log files.
mysql-test/suite/binlog/t/binlog_index-master.opt:
  Force specific names for some log files.
mysql-test/suite/binlog/t/binlog_stm_unsafe_warning-master.opt:
  Force specific names for some log files.
mysql-test/suite/binlog/t/binlog_stm_unsafe_warning.test:
  Better error message if something goes wrong
mysql-test/suite/rpl/r/rpl_flushlog_loop.result:
  Updated results
mysql-test/suite/rpl/rpl_1slave_base.cnf:
  Use --log-basename
scripts/mysql_install_db.sh:
  More information to --help
  Write url to knowledge base if something goes wrong
  Fail at once if we can't create a database directory (no reason to continue and write a screenful of not related text)
scripts/mysqld_safe.sh:
  Also allow one to use --data for --datadir (common shortening)
  Added support for --log-basename
  Fail at once if we can't create a log directory
  Fixed bug where we used a pid file name without '.pid' extension
sql/log.cc:
  Create a log file name trough my_once_alloc()  (To get it automaticly freed at exit)
sql/mysql_priv.h:
  Added new prototype
sql/mysqld.cc:
  Added support for --log-basename
  Better help for a lot of log-filename related variables.
sql/rpl_rli.cc:
  Write information that one can use --log-basename
sql/set_var.cc:
  Add log_basename as a readonly variable

Ensure that all clients reads the appropriate 'client', client-mariadb and 'mariadb' sections from my.cnf
The mysqld server and all clients now reads the new client-server section
Fixed that mysqldumpslow supports new slow log formats and new mysqld --slow- options


client/mysql.cc:
  Read also client-server and client-mariadb sections.
client/mysql_upgrade.c:
  Read also client-server and client-mariadb sections.
client/mysqladmin.cc:
  Read also client-server and client-mariadb sections.
client/mysqlbinlog.cc:
  Read also client-server and client-mariadb sections.
client/mysqlcheck.c:
  Read also client-server and client-mariadb sections.
client/mysqldump.c:
  Read also client-server and client-mariadb sections.
client/mysqlimport.c:
  Read also client-server and client-mariadb sections.
client/mysqlshow.c:
  Read also client-server and client-mariadb sections.
client/mysqltest.cc:
  Read also client-server and client-mariadb sections.
extra/my_print_defaults.c:
  Updated help text
scripts/mysql_fix_privilege_tables.sh:
  Read also sections client client-server client-mariadb
scripts/mysql_install_db.pl.in:
  Also allow --data=* option
  Read also groups mariadb, server and client-server.
scripts/mysql_install_db.sh:
  Also allow --data=* option
  Read also groups mariadb, server and client-server.
  Added --lose-skip-pbxt to bootstrap
scripts/mysql_secure_installation.sh:
  Read also groups client-server and client-mariadb
scripts/mysqld_multi.sh:
  Read also group mariadb
scripts/mysqld_safe.sh:
  Read also groups mariadb server and client-server
scripts/mysqldumpslow.sh:
  Fixed to support new slow log formats
  Added sorting on -ae (aggregated number of retreived rows) and e (retrieved rows)
  Read also group 'mariadb'
  If there is many instances of same option, use last one.
  Get slow log file from options log-slow-queries=filename or query-log-file=filename
  Added support for future --log-basename option
sql-common/client.c:
  Read also groups 'client-server' and 'client-mariadb'
tests/mysql_client_test.c:
  Read also groups 'client-server' and 'client-mariadb'
tests/thread_test.c:
  Read also groups 'client-server' and 'client-mariadb'

Address Monty's review comments

Don't check if LAST_IO_Error has changed as this is not a user variable and it may change depending on timing issues between master and slave