post-review fixes

into  zippy.(none):/home/cmiller/work/mysql/merge/mysql-5.1-new

into  mysql.com:/home/ndbdev/jmiller/clones/mysql-5.1-new

  Fix for failure in aix52 failure during push build

into  mysql.com:/home/mysql-5.1-18997e

if input year for date_add() / date_sub() with INTERVAL is low enough for
calc_daynr() to possibly return incorrect results (calc_daynr() has no information
on whether the year is low because it was a two-digit year ('77) or because it
was a really low four-digit year (0077) and will indiscriminately try to turn the
value into a four-digit year by adding 1900 or 2000 respectively), the functions
will now throw NULL.

into  mysql.com:/data0/mysqldev/my/mysql-5.1-new

into  zippy.(none):/home/cmiller/work/mysql/merge/mysql-5.1-new

into  a193-229-222-105.elisa-laajakaista.fi:/home/my/bk/mysql-5.1-new

into  a193-229-222-105.elisa-laajakaista.fi:/home/my/bk/mysql-5.1-new-merge_060509

The problem is that in a MyISAM table the following column
after a varchar field gets corrupted, if varchar field is
extended.

This should be made to work without a copy in the future, but
I'm not sure if this code is ready yet. This fix will force copy
in this case. It will not do any harm to have it here, only makes
alter table a bit slower in this case. If this should work for
MyISAM, then the bug is somewhere else in that code.

Until it works, I propose this as a temporary fix or a workaround.
Test case for the bug has been added.

into  mysql.com:/usr/local/mysql/tmp-5.1

into  mysql.com:/home/alexi/innodb/mysql-5.1-ss547
 Null merge

into  mysql.com:/home/alexi/innodb/mysql-5.0-ss547-work
 Null merge

 Fix BUG#19542 "InnoDB doesn't increase the Handler_read_prev counter".

 Fix BUG#19542 "InnoDB doesn't increase the Handler_read_prev counter.
 

  
Stored procedure execution sometimes placed the address of auto variables
in the list of Item changes to undo in THD::rollback_item_tree_changes().
This could cause stack corruption.

into  mysql.com:/home/psergey/mysql-5.1-merge2

into  xiphis.org:/home/acurtis/mysql-5.1-merge

into  mysql.com:/home/ndbdev/ngrishakin/mysql-5.1-new

  Delete: mysql-test/r/ndb_partition_range.result
.del-ndb_partition_list.result~7af68cd45e74abf:
  Delete: mysql-test/r/ndb_partition_list.result
.del-ndb_partition_key.result~68b9a59cff8c9840:
  Delete: mysql-test/r/ndb_partition_key.result
.del-ndb_partition_error.result~944f84894e323e9:
  Delete: mysql-test/r/ndb_partition_error.result
.del-ndb_blob_partition.result~fda88ddfc5477a7e:
  Delete: mysql-test/r/ndb_blob_partition.result
.del-ndb_partition_range.test~af8f9016b6648239:
  Delete: mysql-test/t/ndb_partition_range.test
.del-ndb_partition_list.test~940289b3d58595ca:
  Delete: mysql-test/t/ndb_partition_list.test
.del-ndb_partition_key.test~ed7b15c91f66558d:
  Delete: mysql-test/t/ndb_partition_key.test
.del-ndb_partition_error.test~2da477be29be041f:
  Delete: mysql-test/t/ndb_partition_error.test
.del-ndb_blob_partition.test~ea99ef9759705ce3:
  Delete: mysql-test/t/ndb_blob_partition.test

into  a193-229-222-105.elisa-laajakaista.fi:/home/my/bk/mysql-5.1-new-merge_060509

into  c-870ae253.1238-1-64736c10.cust.bredbandsbolaget.se:/home/pappa/bug19010

into  c-870ae253.1238-1-64736c10.cust.bredbandsbolaget.se:/home/pappa/bug19010

into  c-870ae253.1238-1-64736c10.cust.bredbandsbolaget.se:/home/pappa/bug19010

into  c-870ae253.1238-1-64736c10.cust.bredbandsbolaget.se:/home/pappa/bug19010

into  c-870ae253.1238-1-64736c10.cust.bredbandsbolaget.se:/home/pappa/bug19010

into  c-870ae253.1238-1-64736c10.cust.bredbandsbolaget.se:/home/pappa/bug19010

into  a193-229-222-105.elisa-laajakaista.fi:/home/my/bk/mysql-5.1-new-merge_060509

into  mysql.com:/home/ndbdev/jmiller/clones/mysql-5.1-new