small optimisation in signed_literal

into mysql.com:/home/my/mysql-4.1

  Update an obsolete comment about trx commit: we can no longer call trx_undo_update_cleanup_by_discard(), and actually, the idea to call it was erroneous, it cannot work

into mysql.com:/home/my/mysql-4.1

Changed _XXX to _MY_XXX to solve conflict problem on Mac OS X

into mysql.com:/space/my/mysql-4.1

   instead of calling them directly (WL#1521) - this also fixed a compile
   error with libtool-1.5.2 on FreeBSD (error: tag name "CXX" already 
   exists)

into gluh.mysql.r18.ru:/home/gluh/mysql-4.1.clear

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

  Remove includes of sys/types.h and sys/stat.h because these are already included through univ.i

Portability fixes

  Add a comment that InnoDB always retrieves the row id, if the clustered index was internally generated by InnoDB. Then we know the 'ref' to the row.

into teton.kitebird.com:/home/paul/mysql-4.1

  Fix Bug #1942: do not retrieve all columns in a table if we only need the 'ref' of the row (usually, the PRIMARY KEY) to calculate an ORDER BY

into teton.kitebird.com:/home/paul/mysql-4.1

into teton.kitebird.com:/home/paul/mysql-4.1

Added test case for the bug #3155: strange results with index (x, y) ... WHERE x=val_1 AND y>=val_2 ORDER BY pk;
(thankee Monty)

- added unsigned_flag= 1; to Item_uint constructors
- removed Item_uint::fix_fields()
- added a comment about fix_fields() call

into gluh.mysql.r18.ru:/home/gluh/mysql-4.1.clear

Fix for the bug #3155: strange results with index (x, y) ... WHERE x=val_1 AND y>=val_2 ORDER BY pk;
(test case is too big to be included, take a look at the bug database)

into deer.(none):/home/hf/work/mysql-4.1.233

test for IGNORE added

into mysql.com:/home/my/mysql-4.0

into teton.kitebird.com:/home/paul/mysql-4.1

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