Portability fixes

Fixes after last merge from 4.0.
(Code not yet complete, need anoter merge from 4.0)

Added syntax for column comments (for compability with 4.1)
Fix of ALTER TABLE RENAME

into sinisa.nasamreza.org:/mnt/hdc/Sinisa/mysql-4.0

user has table privilege and global FILE privilege

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into sinisa.nasamreza.org:/mnt/hdc/Sinisa/mysql-4.0

Charset convertion FROM dynamic charset is now working too
Allow dynamic charsets in CONVERT()

Added checking of sem_init() in configure.

LIMIT fixed
AVG & STD with subselect fixed
join_free fixed to be depended queries compatible
sort_default removed from SELECT_LEX

into nick.leippe.com:/home/nick/mysql/mysql

added respective test case

All charset.conf files were extended to supply unicode mapping array
CONVERT() now uses more common order of arguments: CONVERT(expr,charset_from,charset_to)
Dynamic charset can be used as CONVERT() argument

Change TRUNCATE(number) to truncate towards zero for negative numbers
Fix NULL handling for DESCRIBE table_name

This fix should be merged into 4.0 and 4.1

Now it properly returns error.
Added respective test case.

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