qtgui: forces min/max sliders for qt_sink waterfall plots to be horizontal.
modtool: added skipping of lib/ and swig/ if sources list is empty
Remove "Bytes to Symbols" block from GRC as bytes_to_syms no longer exists.

(It was removed in commit 45502b80d28e2051f5f7780e0c386147f0976798.)
digital: Fixed example which had invalid default values after changing HPD
Removes qt3 leftovers in qtgui code.
Merge remote-tracking branch 'mbant/oot-modules-without-cpp-maint' into maint
add default OSX homebrew path to FindQwt, last in the list; should never conflict with other OSs nor MacPorts or Fink