wavelet: do not use unsupported compile flags for OSX
Merge branch 'maint'
Update revision to 3.6.5.1.
Merge branch 'maint'

Used merge strategy -s ours to skip release commit
Clean up text docs.
Update revision to 3.7.0.
Update revision to 3.7.1git
grc: revert ce52bd370 fixes problem with order
grc: allow multiple ports with varying nchan
grc: fix port names (index relative to port type not absolute)
grc: white background
grc: white blocks for nicer screenshots
blocks: add append option to file sink