Tweaks to Debian packaging.
Added .so versioning where needed (libpmt, libmblock, libgromnithread) to allow automated dependency checking.
Reverted (perhaps temporarily) to '3.0.svn' version numbering as the '~' trick wasn't working with Ubuntu
Note: the -dev packages don't seem to be sufficient to compile the gr-howto-write-a-block module, so still debugging....
Merged r6224:6268 from features/deb into trunk. Implements most of a Debian package generation system. EXPERIMENTAL.
git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@6269 221aa14e-8319-0410-a670-987f0aec2ac5