gr: fix 2 places where pyc files get generated in-tree
Included the GrPython module to define PYTHON_DASH_B.
Merge branch 'wfm_tx_work'
Merge branch 'maint'
core: buffer alignments were getting confused. Just need to tell all blocks that they are aligned upon restart.
core: makes sure all block's buffers are aligned on start/restart and that they know it.
core: loosen fm modulator QA to 5 decimal places of agreement
core: use while instead of if in frequency_modulator
core: adds vlen and scalar args to type converter blocks in GRC.
Also fixes documentation for these blocks.
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