enable building docs
drop shebang line from a library module

The python file is not supposed to be called on its own, so drop python the shebang.
drop dependency on Boost filesystem

It seems that the filesystem module is not used anywhere in the code, so drop it.
Having it causes
	unused-direct-shlib-dependency /usr/lib64/libgnuradio-rds-0.1.1git.so.0.0.0 /lib64/libboost_filesystem.so.1.54.0
warning from rpmlint on installed library.
update FSF address in license headers