and vice versa"
Initial import of the dtoa.c code and custom wrappers around it to allow
its usage from the server code.

Conversion of FLOAT/DOUBLE values to DECIMAL ones or strings and vice
versa has been significantly reworked. As the new algoritms are more
precise than the older ones, results of such conversions may not always
match those obtained from older server versions. This in turn may break
compatibility for some applications.

This patch also fixes the following bugs:
- bug #12860 "Difference in zero padding of exponent between Unix and
Windows"
- bug #21497 "DOUBLE truncated to unusable value"
- bug #26788 "mysqld (debug) aborts when inserting specific numbers into
char fields"
- bug #24541 "Data truncated..." on decimal type columns without any
good reason"

Additional edits to the 5.0 ChangeSet|1.2519 that are necessary for the fix to work with the new code structure in 5.1.

into  damien-katzs-computer.local:/Users/dkatz/mysql51

Fixed runtime to no longer allow the caching of queries with UDF calls.

into  maint1.mysql.com:/data/localhome/tsmith/bk/maint/51

into  maint1.mysql.com:/data/localhome/tsmith/bk/maint/50

into  maint1.mysql.com:/data/localhome/tsmith/bk/maint/51

into  maint1.mysql.com:/data/localhome/tsmith/bk/maint/50

into  maint1.mysql.com:/data/localhome/tsmith/bk/maint/41

FLUSH LOGS should ignore SET GLOBAL READ_ONLY.

into  mysql.com:/home/svoj/devel/mysql/merge/mysql-5.1-engines

into  mysql.com:/home/svoj/devel/mysql/merge/mysql-5.1-engines

into  mysql.com:/home/svoj/devel/mysql/merge/mysql-5.0-engines

into  pippilotta.erinye.com:/shared/home/df/mysql/build/mysql-5.1

into  pippilotta.erinye.com:/shared/home/df/mysql/build/mysql-5.1

into  pippilotta.erinye.com:/shared/home/df/mysql/build/mysql-5.0

into  whalegate.ndb.mysql.com:/home/tomas/mysql-5.1-engines

into  whalegate.ndb.mysql.com:/home/tomas/mysql-5.1-engines

into  whalegate.ndb.mysql.com:/home/tomas/mysql-5.0-engines

into  whalegate.ndb.mysql.com:/home/tomas/mysql-5.1-new-ndb

into  whalegate.ndb.mysql.com:/home/tomas/mysql-5.1-engines

into  whalegate.ndb.mysql.com:/home/tomas/mysql-5.1-new-ndb

into  whalegate.ndb.mysql.com:/home/tomas/mysql-5.1-engines

into  whalegate.ndb.mysql.com:/home/tomas/mysql-5.0-engines

into  whalegate.ndb.mysql.com:/home/tomas/mysql-5.0-ndb

into  whalegate.ndb.mysql.com:/home/tomas/mysql-5.1-engines

into  whalegate.ndb.mysql.com:/home/tomas/mysql-5.1-engines

- do not print 701 dictionary busy error

into  whalegate.ndb.mysql.com:/home/tomas/mysql-5.1-engines

into  whalegate.ndb.mysql.com:/home/tomas/mysql-5.1-new-ndb

into  whalegate.ndb.mysql.com:/home/tomas/mysql-5.0-engines

- correct test and result file

into  whalegate.ndb.mysql.com:/home/tomas/mysql-5.1-engines

into  whalegate.ndb.mysql.com:/home/tomas/mysql-5.1-engines

into  whalegate.ndb.mysql.com:/home/tomas/mysql-5.0-engines

into  mysql.com:/home/ram/work/b28144/b28144.5.0

into  mysql.com:/home/ram/work/b28144/b28144.5.1

The log tables are by nature PERFORMANCE_SCHEMA tables,
which should not be affected by SET GLOBAL READ_ONLY or FLUSH TABLES
WITH READ LOCK.

The implementation of FLUSH TABLES WITH READ LOCK already ignored log tables.
Now with this patch, the implementation of LOCK TABLE also ignore a
global read lock for log tables, which was the missing symmetry.