As both ndb and im are components that may be disabled as well as the binaries may not exist. Look for 
their binaries in a separate function and produce test casea failures for the test thet needs these components

This can not be done in run_testcase_start_servers as embedded never starts a server
Add error if mysqld_start is called in embedded mode 

into  neptunus.(none):/home/msvensson/mysql/mysql-4.1-maint

Add function mtr_exe_maybe_exists to look for binaries that is optional
Skip ndb support if it's a binary dist where mysqld supports ndb but there is no ndbd

to a value wich is not our default

commands and go directly to result file processing

into  example.com:/work/bug23379/my41-bug23379

  
The value taken to be shown in SHOW PROCESSLIST is not
initialized when THD is created and will be random for
unauthenticated connections.
  
To the documentor: Random value, instead of NULL, was shown,
in SHOW PROCESSLIST for still non-authenticated connections.

into  neptunus.(none):/home/msvensson/mysql/mysql-4.1-maint

into  example.com:/work/bug23379/my41-bug23379

into  neptunus.(none):/home/msvensson/mysql/mysql-4.1-maint

into  neptunus.(none):/home/msvensson/mysql/mysql-4.1-maint

into  example.com:/work/bug23379/my41-bug23379

The value taken to be shown in SHOW PROCESSLIST is not
initialized when THD is created and will be random for
unauthenticated connections.

To the documentor: Random value, instead of NULL, was shown,
in SHOW PROCESSLIST for still non-authenticated connections.

into thinking the escaped % + w was a format specifier

Improve code that detects if ndb shuold be installed
Remove call to stop_all_servers after install db, if any servers are still running 
and need to be stopped they will be stopped atuomatically

Set comment properly before calling mtr_report_test failed and report_failure_restart 

When calculating what features to use for _this_ test run, don't look at test that already are deterined to be skipped

into  siva.hindu.god:/usr/home/tim/m/bk/tmp/mrgOct16/41

Add verbose printouts making it possible to see what happens.
Make it an error if trying to stop a non existing timer
Print warning if fork fails.

into  shellback.(none):/home/msvensson/mysql/mysql-4.1-maint

mysqltest.test on Solaris and Mac. write_file produced nice files with all zeroes.

into  mysql.com:/usr/home/ram/work/bug23254/my41-bug23254

We don't set null_value to 0 in the Item_func_compress::val_str() for 
not-NULL results.

Now also detects "source nnnn;" command, previous version only detected
"--source"

Improve function that finds the reason why test was skipped, the old version only looked at the ast line, but there might be some additional debug info there so it's better to scan the whole file. 
There should be only one line that says "reason: <reason>"