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.

  Fix for bug #15841: Change in sql_map.cc and mmap breaks on HP-UX
  - in order to enable the mmap64() (and others) define
  _LARGEFILE64_SOURCE in case of _LARGEFILE_SOURCE defined on HPUX.

on AIX 5.2"

Added dummy definition of MAP_NORESERVE for systems which doesn't provide it,
removed duplicates

my_sys.h:
  added definition for MAP_NORESERVE
  (for Irix and AIX systems)
sql_map.cc:
  removed definition of MAP_NORESERVE
mi_packrec.c:
  removed definition of MAP_NORESERVE and MMAP_PRIVATE

    Fix a typo: Trailing ";" for "source" command.

into  mysql.com:/home/hartmut/projects/mysql/dev/5.1

  Test require Berkeley DB

  Script "my_print_defaults" is to be searched for as executable

  Disabled 'type_time' until 15805 is closed

  Added "client/mysqlslap"
mysqlslap.vcproj, mysqlslap.def:
  new file

  Added 5.0 specific build scripts

into mysql.com:/Users/kent/mysql/bk/mysql-5.0

  Adjusted listing of files to put into source TAR

into mysql.com:/Users/kent/mysql/bk/mysql-4.1

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

into  regul.home.lan:/mnt/md/bk/mysql-5.0

Restore "make dist" for the header files in "storage/innobase/include".

with 20 test loops in case when any limit parameter was specified

into mysql.com:/home/hf/work/mysql-5.1.clean

into mysql.com:/home/hf/work/mysql-5.1.clean

into  mysql.com:/home/alexi/dev/mysql-5.0-12440

 long fraction and/or large exponent part".

into  perch.ndb.mysql.com:/home/jonas/src/mysql-5.1-new

into  perch.ndb.mysql.com:/home/jonas/src/mysql-5.1-new

into trift-lap.fambruehe:/MySQL/M51/work-5.1

into mysql.com:/home/hf/work/mysql-5.1.clean