get up-to-date with the gst_caps_debug api improved capsnego in mad improved capsnego in adder improved capsnego in i...

Original commit message from CVS:
* get up-to-date with the gst_caps_debug api
* improved capsnego in mad
* improved capsnego in adder
* improved capsnego in intfloat plugins
* unbroke capsnego in stereomono plugins
* fix cothread stack allocation within the main thread in new cothreads