This is the first changeset of suggested changes recommended in Kostja's 
review of my patch, 1.1846, which includes only functionality changes. 
Style changes/Documentation patch to follow.

into krsna.patg.net:/home/patg/mysql-5.0

into mysql.com:/home/my/mysql-5.0

into serg.mylan:/usr/home/serg/Abk/mysql-5.0

into mysql.com:/home/psergey/mysql-5.0-build

into serg.mylan:/usr/home/serg/Abk/mysql-5.0

  Take into account that bitmap_is_set() may return any non-zero zero value when the bit is set.

into hundin.mysql.fi:/home/heikki/mysql-5.0

into mysql.com:/home/my/mysql-5.0

  Disable the XA code in InnoDB crash recovery; when Jan and Sergei want to test XA, they should revert this patch

into mysql.com:/home/my/mysql-4.1

into hundin.mysql.fi:/home/jan/mysql-5.0

into 51.0.168.192.in-addr.arpa:/Users/bell/mysql/bk/work-4.1

Fixed failing myisam.test and rpl_rotate_logs.test on some configurations

independently from the expression it is initialized from.
In other words, this change treats a user variable like
a table with one column and one record. Discussed with 
PeterG, Serg and Lars. This change also simplifies replication
allowing not to replicate variables' coercibility.

into 51.0.168.192.in-addr.arpa:/Users/bell/mysql/bk/work-4.1

into mysql.com:/home/my/mysql-4.1

Change string->float conversion to delay division as long as possible.
This gives us more exact integer->float conversion for numbers of type '123.45E+02' (Bug #7740)

into mysql.com:/home/jonas/src/mysql-5.0

  split into script/conf for easier deployment

  Treat unknown characters straight in a query as syntax error, rather skipping it as a space character.

  optimize test_if_minus() when not UCS2 support is compiled.

into serg.mylan:/usr/home/serg/Abk/mysql-5.0

into mysql.com:/home/mysqldev/tulin/mysql-5.0

into poseidon.ndb.mysql.com:/home/tomas/mysql-5.0