When only one row was present, the subtraction of nearly the same number 
resulted in catastropic cancellation, introducing an error in the 
VARIANCE calculation near 1e-15.  That was sqrt()ed to get STDDEV, the 
error was escallated to near 1e-8.  

The simple fix of testing for a row count of 1 and forcing that to yield 
0.0 is insufficient, as two rows of the same value should also have a
variance of 0.0, yet the error would be about the same.

So, this patch changes the formula that computes the VARIANCE to be one
that is not subject to catastrophic cancellation.

In addition, it now uses only (faster-than-decimal) floating point numbers
to calculate, and renders that to other types on demand.

into  zippy.cornsilk.net:/home/cmiller/work/mysql/bug22860/my50-bug22860

Support says that memlock doesn't work on OSes other than Solaris.  
Add a warning about --memlock to the crash monologue.

  on large length
  
Problem:  Most (all) of the numeric inputs were being coerced into
int (32 bit) sized variables.  Works OK for sane inputs; any input
larger than 2^32 (or 2^31 for signed vars) exihibited predictable
wrapping behavior (up to about 10^18) and then started having really
strange behaviour past that point (since the conversion to 64 bit int
from the DECIMAL type can do weird things on out of range numbers).

Solution: 1)  Add many tests.  2)  Convert input from (u)long type to
(u)longlong.  3)  Do (sometimes multiple) sanity checks on input,
keeping in mind that sometimes a negative longlong is not a negative
longlong (if the unsigned_flag is set).  4) Emulate existing behavior
w/rt negative and "small" out-of-bounds values.

into  zippy.cornsilk.net:/home/cmiller/work/mysql/mysql-4.1-maint

into  zippy.cornsilk.net:/home/cmiller/work/mysql/bug23411/my50-bug23411

  
The Item_func_mod objects never had maybe_null set, so users had no reason 
to expect that they can be NULL, and may therefore deduce wrong results.
Now, set maybe_null.

into  neptunus.(none):/home/msvensson/mysql/mysql-5.0-maint

into  neptunus.(none):/home/msvensson/mysql/mysql-5.0-maint

into  neptunus.(none):/home/msvensson/mysql/my50-m-stress

Use lowercase for "Too long dbname" test as it will be put ot lower on some platforms and we don't wan't to test that.

into  neptunus.(none):/home/msvensson/mysql/my50-m-stress

into  neptunus.(none):/home/msvensson/mysql/mysql-5.0-maint

into  zippy.cornsilk.net:/home/cmiller/work/mysql/mysql-5.0-maint

into  zippy.cornsilk.net:/home/cmiller/work/mysql/mysql-4.1-maint

into  shellback.(none):/home/msvensson/mysql/mysql-4.1-maint

  Raise version number to 4.1.23

into  rolltop.ignatz42.dyndns.org:/mnt/storeage/mysql-5.0-maint

into  rolltop.ignatz42.dyndns.org:/mnt/storeage/mtr_vs_config/my50-mtr_vs_config

Visual Studio builds each configuration in a different sub-directory.  Only the sub-
directories for release and debug are currently searched.

into  kpdesk.mysql.com:/home/thek/dev/mysql-5.0-maint

into  kpdesk.mysql.com:/home/thek/dev/mysql-4.1-maint

- 'false' not defined in C, use FALSE instead.

- 'false' not defined in C, use FALSE instead.

into  mysql.com:/usr/home/ram/work/bug22913/my41-bug22913

into  mysql.com:/usr/home/ram/work/bug22913/my50-bug22913

into  mysql.com:/usr/home/ram/work/bug22913/my50-bug22913