Added a simple optimizer that shortcuts jumps and skip unused instructions.

Simply disallow it, just as we disallow creation of routines from within
other SPs.

at least partially. It doesn't crash or give packets out of order
any more, but it's unclear why it doesn't actually return anything
from within an SP. This should be investigated at some point, but
for the moment this will have to do. (It is a rather obscure feature... :)

non-ascii filenames work weird (e.g. on MacOSX)

into serg.mylan:/usr/home/serg/Abk/mysql-5.0

(including one which may explain autobuild's failure of yesterday)

(The fix was merged in from 4.1)

Fix for stored procedures BUG#4726: Stored procedure crash when looping over SELECT with complex WHERE's.

  mysqld crashes on CREATE TABLE in a database with corrupted db.opt file.
  Bug#4646

Accidently worked on many platforms, but not all.

into neptunus.(none):/home/magnus/mysql-4.1

into sanja.is.com.ua:/home/bell/mysql/bk/work-5.0

made different fields for view updatebility in principle and updatability during this execution (BUG#4601)

Sub-CALLs of procedures zapped thd->current_arena for good.

fixed error handling

Removing old directories for test/ using bk rmdir

  usable for unix builds": zlib 1.2.1 imported

into sanja.is.com.ua:/home/bell/mysql/bk/work-4.1

into sanja.is.com.ua:/home/bell/mysql/bk/work-5.0

into serg.mylan:/usr/home/serg/Abk/mysql-4.1

new tests to ensure that prepared statement *really* work
(and that MySQL not picks up some number from arbitrary location
that happens to match the parameter's value)