cmake: cmake doesn't have a FIND command for STRING until 2.8.5, so we're just cehcking for that here before using it.

Using cmake < 2.8.5 will not dedup the cflags, but this is non-critical.
trellis: updated examples.

+ Fixed paths to match GNURADIO-3.7.x conventions
+ Fixed errors with dimensionality
+ Changed to QT-widgets
trellis: working on issue to fix locations of fsm files in examples.

+ Workaround for the path problem with cmake to use templates for install
+ GRC blocks now check if FSM_Args are strings and if the file exists
+ Changed example generation with CMake
volk: calling enable_languages here is buggy until 2.8.10. Version checking for that.