MI: add the -catch-load and -catch-unload commands

MI: add the -catch-load and -catch-unload commands

They are equivalent to "catch load" and "catch unload" from CLI.

Rationale: GUIs might be interested in catching solib load or
unload events.

2012-11-16  Mircea Gherzan  <mircea.gherzan@intel.com>

	* Makefile.in (SUBDIR_MI_OBS): Add mi-cmd-catch.o.
	(SUBDIR_MI_SRCS): Add mi/mi-cmd-catch.c.
	* breakpoint.c (add_solib_catchpoint): New function that
	can be used by both CLI and MI, factored out from
	catch_load_or_unload.
	(catch_load_or_unload): Strip it down and make it use the
	new add_solib_catchpoint.
	* breakpoint.h (add_solib_catchpoint): Declare it.
	* mi/mi-cmd-break.h: New file.
	* mi/mi-cmd-break.c: Include mi-cmd-break.h.
	(setup_breakpoint_reporting): New function used for both
	catchpoints and breakpoints.
	(mi_cmd_break_insert): Use setup_breakpoint_reporting.
	* mi/mi-cmd-catch.c: New file.
	* mi/mi-cmds.c (mi_cmds): Add the handlers for -catch-load
	and -catch-unload.
	* mi/mi-cmds.h: Declare the handlers for -catch-load and
	-catch-unload.