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'