2006-08-27 [colin] 2.4.0cvs100

	* src/folder.c
		Don't use F_UNKNOWN folders for any default
		outbox/trash/etc
	* src/plugins/bogofilter/bogofilter.c
	* src/plugins/bogofilter/bogofilter.h
	* src/plugins/bogofilter/bogofilter_gtk.c
		Add an option to specify the path to bogofilter
		Use single-quotes to be able to learn in folders
		with spaces in their names
		Verify learning status