howto: make versioned libraries
Refactor gr-howto-write-a-block such that it no longer installs intothe gnuradio python namespace, but rather in the howto namespace.
This allows it to be installed under a separate --prefix in the commoncase where the user doing the "out of tree build" is going to be...
howto: adds C++ QA code
howto: reorganized directory structure
Moved lib to top levelMoved python to top levelSeparated swig generation into new top level directory