Added NULL initilizers for commit_by_xid and rollback_by_xid in hton struct. Changed back table->in_use to current_thd.

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

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

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

into pcgem.rdg.cyberkinetica.com:/var/db/bk/work-acurtis/bug4445.2

into pcgem.rdg.cyberkinetica.com:/var/db/bk/work-acurtis/bug4445.2

  Make a more informative platform info for Windows

into mysql.com:/home/pem/work/mysql-5.0

into gluh.mysql.r18.ru:/home/gluh/MySQL/mysql-5.0

Since placement operator delete called only if exception was thrown in
constructor and we don't use exceptions in MySQL, there is no sense to
do anything in String::delete(void *ptr_arg, MEM_ROOT *mem_root).

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

Simple optimzations done while reviewing code

  small bugfix "ERROR Message: failed"

into hundin.mysql.fi:/home/marko/k/mysql-4.0

This fixes also the reverse lookup bug introduced by the previous patch

on some 64-bit platforms (e.g. IRIX, non-debug build).

(Bug #5822)

into rurik.mysql.com:/home/igor/dev/mysql-5.0-0

delete is declared. As we don't use exceptions placement delete is never 
called and the fix only affects numerous warnings when
compiling with MS Visual C++.
For more info see http://www.gotw.ca/gotw/010.htm.