nb. this currently just interleaves pages from the given Ogg input files,
so it doesn't guarantee temporal interleaving; however granulepos etc. is
preserved. Fixing this requires reordering within the packet queue by metric
(partly complete in liboggz/oggz_write.c), or else a pull-based importer
mechanism like in libannodex.

any number of input files can be given, and each input file can contain
multiple logical bitstreams. All logical bitstreams from all input files
will be interleaved into the output file (stdout if none given).


git-svn-id: http://svn.annodex.net/liboggz/trunk@441 8158c8cd-e7e1-0310-9fa4-c5954c97daef