fixes installation location for pkgdata

This fixes the installation behavior as well as the paths to things that are installed to the ```dist_pkgdata``` directory.

Normal ```automake``` installation behavior depends on the ```_DATA``` suffix for ```dist_pkgdata``` primaries; i.e., things that are referenced by variables with a different suffix aren't installed (by default).

Also, I added the ```nobase_``` prefix to those variable names to prevent automake from collapsing the path for each of the ```dist_pkgdata_DATA``` files. This is necessary to prevent files with identical ```basename``` from colliding during execution of the ```make install``` target.