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.
Major Makefile.am housecleaning. Passes distcheck.
Move all occurrences of swig_built_sources out of Makefile.am's.Move all SWIG related use of BUILT_SOURCES out of Makefile.am's.Clean up 'if PYTHON' conditionalization in gr-*
Still left to do: fix Makefile.swig CLEANFILES and no_dist_files...
Removed link to missing .png in an attempt to keep doxygen from crashing
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