reading about out-of-tree-modules here
http://gnuradio.org/redmine/projects/gnuradio/wiki/OutOfTreeModules
Theres a ref to Cgran website for out-of-tree-modules etc but the site
is dead! https://www.cgran.org/
anyone know of a good place for out of tree blocks? I just want to check
noone has made a comparator or IF statement block before I start
re-inventing the wheel 