by adding sleep-and-retries (max 4 times) if MASTER_POS_WAIT() returns NULL
in sync_with_master and sync_slave_with_master.
The problem showed up only today, in MySQL 5.0 in rpl_server_id2.test,
but may affect 4.x as well, so fixing it here. Note that I am also fixing
5.0 too, with the same exact patch, because I don't want to leave 5.0 broken
until the next 4.0->4.1->5.0 merge.

  Backport suppression of MSVC++ warning from 4.1

 - Tagged ChangeSet@1.1800.1.1 as "mysql-4.0.19"

into serg.mylan:/usr/home/serg/Abk/mysql-4.0

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

into mysql.com:/home/mydev/mysql-4.0-bug2831

into serg.mylan:/usr/home/serg/Abk/mysql-4.0

"phrase search" should not match partial words (it should not match 'paraphrase searches')

into mysql.com:/home/mydev/mysql-4.0-bug2831

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

into mysql.com:/home/mydev/mysql-4.0-bug2831

into a80-186-24-72.elisa-laajakaista.fi:/home/my/bk/mysql-4.0

to use long query strings with it.
Bug#3633

into mysql.com:/home/mysql_src/mysql-4.0

into mysql.com:/home/mysql_src/mysql-4.0

very minor changes: a STOP SLAVE in a replication test to get rid of a non critical message in slave.err,
and a comment update

(Bug #3596)

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

just for beauty of truth.

into mysql.com:/home/mysql_src/mysql-4.0

in hard-coded replication messages, always put small-length info (error codes, explanation of the error) at the beginning,
so that it is not cut by truncation if the query is very long (which happens if the query goes first).

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