- Fixed Bug#2346
- Fixed Bug#2378
- Fixed bug in pager (no Bug#ID (?))
- Added support for new special situations option type, GET_DISABLED.
  See handling of --debug in mysql.cc. compiled wihtout debugging, as an
  example.


client/mysql.cc:
  - Added missing documentation to some options.
  - Fixed a bug in pager (no Bug#ID found (?)), but reported on internals list
    with subject "[PATCH] Fix pager problems in mysql client"
  - Fixed Bug#2346, "unique prefix is enough" option behaviour can be confusing with --debug
include/my_getopt.h:
  Added new option type, GET_DISABLED.
include/mysys_err.h:
  New exit code for my_getopt.
mysys/my_getopt.c:
  - Added handling for GET_DISABLED option type (Fix for Bug#2346)
  - Fixed Bug#2378, "Problem with option abbreviation"