xbps_api.h: update comments, sort.
xbps_api.h: update comments, sort.

--HG--
extra : convert_revision : xtraeme%40gmail.com-20091130104825-s5rc7h69l1avxjk9

ebfe/xbps,stpx/xbps,datenwolf/xbps,stpx/xbps,ebfe/xbps,datenwolf/xbps,ebfe/xbps,datenwolf/xbps,stpx/xbps