pmt_io: adding string conversion for uniform vectors

Sadly, this needed expansion of unv_template, otherwise I'd have to
hand-write gengen-style code in pmt_io.cc
pmt: adding uint64 sugar
pmt: support conversion of basic pmt pairs to python
pmt: making uint64_t sugar more friendly
blocks: Added tsb_vector_sinks
blocks: updated some QAs to use proper tsb functions
digital: updated some QAs to use proper tsb functions
runtime: Added packet_utils and marked tagged_streams.py for removal in future
uhd: Nicer labels for device args and addres in GRC
Merge branch 'uint64_sugar' of git://github.com/osh/gnuradio
blocks: agc3 invsqrt volk kernel aligned assumption is not safe
Merge branch 'maint'
Merge remote-tracking branch 'martin/tsb/prep_for_38'
Merge remote-tracking branch 'martin/uhd/clearer_grc_args'
Merge branch 'master' into next
vocoder: merge final codec2 update
zeromq: Add qa code for zeromq_pubsub
Merge branch 'master' into next
trellis: fix typos in examples
Merge branch 'maint'