Name: add_xverb - add an abbreviatable verb triggering a function

Synopsis:
	void add_xverb(string str);

Note:
	This function is OBSOLETE as the verb can be given directly with
	the efun add_action(). It just remains for compatibility and will
	probably become a simulated efun.

Description:
	This function is connected to the add_action efun. It will set up
	the command "str" to trigger a call to the function set up by the
	previous call to add_action. The difference to add_verb is that
	the command can be abbreviated just like when using add_action
	with the third parameter set to V_NOSPACE (=32, have a look in
	/include/sentence.h for V-flags).

Return value: none

Examples: none

See also: efun/add_action, efun/query_verb, efun/add_verb