Updated cf_section_sub_find_name2 to be a little smarter, and to

	Updated cf_section_sub_find_name2 to be a little smarter, and to
	better support modules.c & modcall.c, which try to look modules
	up by name1 or name2.

	New function cf_data_find & cf_data_add, where other code can add
	named data to be "associated" with a particular configuration section.

	Updated modules.c so that the module_instance_t structure is stored
	via cf_data_add(), rather than in a static pointer.  This means
	that it now gets automagically free'd when the configuration
	section gets freed, which simplifies out lives.

	It also means that the whole "reread conf files" may become easier,
	as we can now read a new configuration file, do a 'diff' with the
	old one, and potentially move the module instance data from the
	old to the new, and therefore NOT shutdown & restart all of the
	modules on a HUP.