WL#2985 "Partition pruning": added "integer range walking", small change forgotten in previous cset 

- post-...-post review fixes
- Added "integer range walking" that allows to do partition pruning for "a <=? t.field <=? b"
  by finding used partitions for a, a+1, a+2, ..., b-1, b. 

into  pylon.mylan:/home/psergey/mysql-5.1-26dec-merge

into  mysql.com:/home/psergey/mysql-5.1-26dec-merge

into  pylon.mylan:/home/psergey/mysql-5.1-26dec-merge

  added item_xmlfunc.cc

  Delete: libmysqld/item_xmlfunc.cc

adjust SEL_TREE::keys_map appropriately.

- Added more comments.
- Added a RANGE_OPT_PARAM::remove_jump_scans flag that disables construction of index_merge
  SEL_TREEs that represent unusable conditions like "key1part1<c1 OR key2part2<c2"
- make prune_partitions() function handle the case where range analysis produces a list of 
  index_merge trees (it turned out that this is possible, appropriate test case added).
- Other small fixes.

into  mysql.com:/home/my/mysql-5.1

--engine="myisam,archive"

--number-of-rows has been removed for the time being and replaced with
 option to allow you to just repeat multiple time all of the inserts you specifed with data. When number-of-rows-returns it will be instead used for averaging rows while growing concurrency. 

Returned stats now has accurent row and query counts since it includes a multiple for the rows and queries added.

Parser is now a touch smarter and understands end of file issues if you have a delimiter at the end of the file.  

into  zim.(none):/home/brian/mysql/cluster-5.1

1) Parsing now works
2) Options are safer, aka it doesn't kill the machine and it cleans up after itself
3) Option of --only-print added so that you can see what it does.
4) Tiny cleanup of the auto generate sql. A lot more needs to be done with this, for it to be very valuable. I suspect it doesn't work all that well.
5) Delimeter is now a single character. No good escaping going on.
6) You can now change which schema it is runninng against.

Now I think I can go make use of it! 

Though I need to add support for a "only run this many inserts, divide by the number of clients connecting, to really test scaling"

into  mysql.com:/home/dlenev/src/mysql-5.1-merges

into  zim.(none):/home/brian/mysql/archive-5.1

Fix for Antony's push. I've also changed from using the zlib off_t pointer type to my_off_t to fix issues around buggy zlib versions and to make sure file sizes are consistent through out mysql.

When not generating 'tags' file, also don't generate symlinks to it (or make dist will fail/behave wierdly).
(origin:   1.1985 05/12/22 23:31:15 knielsen@mysql.com +1 -0)

into  zim.(none):/home/brian/mysql/archive-5.1

AZIO differs in that it uses mysys methods and removes all of the malloc calls. 

into  zim.(none):/home/brian/mysql/cluster-5.1

into  mysql.com:/home/bk/b15920-mysql-5.1-new

Remove errorneously committed ChangeLog file.

  Fixing faulty tests preventing some CREATE TEMPORARY TABLE statements
  from being binlogged under statement-based replication.

into  zim.(none):/home/brian/mysql/cluster-5.1

1) Fixes breakage in embedded server build for XMLPath push.
2) Hides PARTITION engine from view.
3) Add ENGINES information schema (and it should now be clear from this patch on how to turn any show command into an information schema).

This includes both code and test cases.