runtime: added a tag_checker class for more tag handling capabilities.
GRC: show categories from XML tree files in search
channels: Added option to block tags from propagating
digital: Fixed bug where OFDM Tx hier block would ignore 2nd sync word
digital: Rewrite of ?x_ofdm.grc examples to allow all configs with minimal user interaction, make clearer
Merge remote-tracking branch 'skoslowski/search_block_tree'
Merge remote-tracking branch 'martin/chantagdelete'
Merge remote-tracking branch 'martin/ofdm-fixes'
grc: fix instance of namespace change in error_rate.py
Merge branch 'maint'
grc: slash key activates search
blocks: add append option to file sink
modtool: Fixes for in-tree adds, argument parsing (&-bug)
Merge remote-tracking branch 'skoslowski/search_block_tree'
Merge branch 'maint'
volk: fixed volk rotator kernel to support aligned and unaligned.

blocks: added rotateN to rotator that calls VOLK kernel.
build: don't allow us to build against QWT 6.1 until we can update to support it.
Merge branch 'maint'
volk: fixed rotatorpuppet for avx.
Merge branch 'maint'