* oggz_get_next_start_page internal function also finds continued
	pages with packets>1 (used to just find non-continued pages)
	* better debugging for get_prev_start_page
	* fixed return types for oggz_seek_units and related static functions


git-svn-id: http://svn.annodex.net/liboggz/trunk@574 8158c8cd-e7e1-0310-9fa4-c5954c97daef