digital: HPD fixes (burst ID tags are no more propagated; buffer sizes are halved to est. max output size)
modtool: bugfixes for in-tree operation (include paths, license, cmake editing)
blocks: fix pdu_to_tagged_stream when saving leftover items
Merge remote-tracking branch 'martin/hpd-modtool-fixes' into maint
digital: fix CID 1090058 and 1043272 in constellation
digital: Fix CID 1043268 and 1043271
grc: fix search entry focus (again)
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.