post-merge fixes: some things work differently in 5.1

into  mysql.com:/misc/mysql/24907/51-24907

Server failed in assert() when we tried to create a DECIMAL() temp field
with a scale of more than the allowed 30. Now we limit the scale to the
allowed maximum. A truncation warning is thrown as necessary.

into  alf.(none):/src/bug28535/my51-bug28535

- Fixed error message.

into  zippy.cornsilk.net:/home/cmiller/work/mysql/mysql-5.1-maint

into  sin.intern.azundris.com:/home/tnurnberg/31253/51-31253

after-merge fixies

into  sin.intern.azundris.com:/home/tnurnberg/19828/51-19828

into  pilot.mysql.com:/data/msvensson/mysql/mysql-5.1-new-maint

into  pilot.mysql.com:/data/msvensson/mysql/mysql-5.0-maint

into  pilot.mysql.com:/data/msvensson/mysql/mysql-5.0-maint

into  shellback.(none):/home/msvensson/mysql/mysql-5.1-maint

Our web server has been restructured several times, and references
to it in our source code has stayed the same.  This patch from Paul
DuBois updates all URLs to modern semantics.

into  sin.intern.azundris.com:/home/tnurnberg/19828/51-19828

into  shellback.(none):/home/msvensson/mysql/mysql-5.1-maint

Write .reject file to r/ if it's writable else use opt_logdir 

into  shellback.(none):/home/msvensson/mysql/mysql-5.1-maint

 - "mysqld --verbose --help" need to be started in a writable directory 

into  shellback.(none):/home/msvensson/mysql/mysql-5.1-maint

 - Allow test case names to be specied in various different ways

into  sin.intern.azundris.com:/home/tnurnberg/19828/51-19828

into  sin.intern.azundris.com:/home/tnurnberg/31253/51-31253

convert(<invalid time>, datetime) in WHERE caused crash as function
returned (void*)NULL, but did not flag SQL NULL. It does now.

into  sin.intern.azundris.com:/home/tnurnberg/31227/51-31227

into  sin.intern.azundris.com:/home/tnurnberg/31227/50-31227

into  sin.intern.azundris.com:/home/tnurnberg/31227/51-31227

Reserve the space for the leading 0 (before the decimal point) in DECIMAL(a,a) ZEROFILL.

into  sin.intern.azundris.com:/home/tnurnberg/30444/51-30444

into  sin.intern.azundris.com:/home/tnurnberg/30444/50-30444

into  polly.(none):/home/kaa/src/maint/mysql-5.0-maint

into  polly.(none):/home/kaa/src/maint/mysql-5.1-maint

into  polly.(none):/home/kaa/src/maint/mysql-5.1-maint

into  polly.(none):/home/kaa/src/maint/mysql-5.0-maint