grc: use dashed lines for message connections
Merge branch 'maint'
Add a toolchain file for cross compiling.

This file depends on using a toolchain built from OpenEmbedded using
the populate_sdk function.

Signed-off-by: Philip Balister <philip@balister.org>
Signed-off-by: Doug Geiger <doug.geiger@bioradiation.net>
Merge remote-tracking branch 'skoslowski/grc_toggle_widgets'
Merge branch 'maint'
docs: fixed doxygen warning.
docs: fixed exploring-gnuradio examples and added to doxygen manual.
pmt: added class comparator to rename comperator (to be removed in 3.8).
blocks: prevent alowing more input streams than this block uses.
docs: fixed/modifying/adding documentation for blocks a-l.
digital: fixed warnings about order of initializing variables in constellation.
Merge branch 'maint'
modtool: no more exit() in modtool package