API change, bugfix, more debug data

More debug data is now output by Microcosm. A bug has been fixed in the
image reprojection code. Also, some debug sink functions have been
changed to accept signed dimensions instead of unsigned because there is
no reason for it and it hinders flexibility.
Conformant to API, some new changes

Changed function signatures to conform to the new sdimension related API
changes. Fixed some bogus layer->string mappings and fixed opacity so it
works now.