Bug#31610 Remove outdated and redundant tests:
                 partition_02myisam partition_03ndb
       Bug#32405 testsuite parts: partition_char_myisam wrong content
and cleanup of testsuite
   - remove/correct wrong comments
   - remove workarounds for fixed bugs
   - replace error numbers with error names
   - exclude subtests from execution which fail now because of
     new limitations for partitioning functions
   - remove code for the no more intended dual use
     fast test in regression tests/slow test in testsuite
   - analyze and fix problems with partition_char_innodb
   - fix problems caused by last change of error numbers
   - Introduce error name to error number mapping which makes
     maintenance after next error renumbering easier