grc: moved all usrp1 and usrp2 stuff out of grc and into gr-usrp*/grc
Moved grc xml files, python wrappers (USRP1 only), probe apps + freedesktop files.
When the gr-usrp and gr-usrp2 directories are removed, grc will not have to change.
Minor change: the freedesktop files are always installed now....
Add missing .test files to tarball.
Add scheme-ish convenience functions to usrp2.scm.
Add minimal guile test code gr-usrp2.
Rename usrp2.i to usrp2_swig.i to allow insertion of guile convenience functions.
Rename libguile- to libguile-gnuradio- to match guile library naming convention.
The stuff in gnuradio-core ends up with funky names, but that couldbe fixed by renaming gnuradio_core_filter.i -> core_filter.i etc.
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