Clean up 'unused argument' warnings

Add extern "C" { ... } in my_pthread.h

  Fixed danish SunSite mirror

Let myisamchk generate a new checksum for compressed data.
Don't unconditionally force filenames to lower case on windows.
Update mysqltest to match 4.0 source (to get some of the new bug fixes into 3.23)

into tetra.spaceapes.com:/home/jcole/bk/mysql

do val_int() on their arguments before starting the computation. 
Similar fixes are need for +-* and probably several other but I want
to make sure Monty is fine with my fix approach before changing a lot
of code. 

Amazingly,
this bug is not as critical as you would expect since very few functions do val_int()
on their arguments ( from_unixtime(), sec_to_time()), and those not
very frequently perform a computation on their floating point arguments.
which is probably why no one has yet reported this bug. Another 
possibility is that the result is usually wrong by no more than 5%,
which makes it hard to catch it. I found it when trying to compute mile
splits for 30:47 10K - it told me 5:07, and I knew it was wrong because
5:00 mile gives you 31:08. However, if I had not run as many 10K races,
I would have easily believed that 30:47 10K is a 5:07 mile pace and 
would not have noticed the bug.

into mysql.sashanet.com:/home/sasha/src/bk/mysql

  Fixed contributed software link

  Added mirror in Hong Kong

into mysql.sashanet.com:/home/sasha/src/bk/mysql

Replaced @strong{MySQL AB} with MySQL AB

row0sel.c	Fix a memory freeing bug when a row which contains an externally stored long field in the middle of the row is fetched in a SELECT
srv0start.c	Allow drive name followed by a ':' in a data file path
ha_innobase.cc	Allow drive name followed by a ':' in a data file path

into mysql.sashanet.com:/home/sasha/src/bk/mysql

Added record_rnd_buffer
Added --safe-user-create
Fix for ALTER TABLE RENAME on windows

Portability fixes
Fixed problem when giving wrong arguments to myisam_recover
Fix to remove warnings when using purify