fix C coding error found by tomas on sol9x86

into mishka.local:/home/my/mysql-4.1

Simple optimzations and cleanups
Removed compiler warnings and fixed portability issues
Added client functions 'mysql_embedded()' to allow client to check if we are using embedded server
Fixes for purify

into poseidon.ndb.mysql.com:/home/tomas/mysql-4.1

into poseidon.ndb.mysql.com:/home/tomas/mysql-4.1-ndb

into poseidon.ndb.mysql.com:/home/tomas/mysql-4.1

into poseidon.ndb.mysql.com:/home/tomas/mysql-4.1-ndb-merge

into poseidon.ndb.mysql.com:/home/tomas/mysql-4.1-ndb-merge

into poseidon.ndb.mysql.com:/home/tomas/mysql-4.1

  InnoDB: print info about how many bytes we were able to read if a file read is not able to read as many bytes as we requested

into hundin.mysql.fi:/home/marko/j/mysql-4.1

  minor fixes

  Check DERIVATION_NONE only for UNIONS.

contributed by Takeshi. I also added HEX support for 
"extended-inserts".

  Replace a tolower() loop with innobase_casedn_str()

into mysql.com:/space/pekka/ndb/version/my41-tux

into poseidon.ndb.mysql.com:/home/tomas/mysql-4.1-ndb

into poseidon.ndb.mysql.com:/home/tomas/mysql-4.1

into poseidon.ndb.mysql.com:/home/tomas/mysql-4.1-ndb

  If innodb_thread_concurrency would be exceeded, let a thread sleep 10 ms before entering the FIFO queue; previously, the value was 50 ms, which Peter Z considered too long

into poseidon.ndb.mysql.com:/home/tomas/mysql-4.1

  new file

into poseidon.ndb.mysql.com:/home/tomas/mysql-4.1

+ some fixed string length cleanup
+ fixed a better error printout

into gw.mysql.r18.ru:/usr/home/ram/work/4.1.b6057

  Remove unnesessary code: use_mb is always TRUE for the multibyte charsets.

into poseidon.ndb.mysql.com:/home/tomas/mysql-4.1-ndb-merge

into gw.mysql.r18.ru:/usr/home/ram/work/4.1.b6057

Now we use TABLE::timestamp_field_type instead of
TABLE::timestamp_default_now/on_update_now for determining
if we should auto-set value of TIMESTAMP field during this operation.
We are also use Field_timestamp::set_time() instead of
handler::update_timestamp().