blocks: converting blocks to v3.7 style in gr-blocks.

delay, rms, unpacked_to_packed, packed_to_unpacked
Merge branch 'master' into next
blocks: implementing averaging inside rms blocks.

single_pole_iir_filter lives in gr-filter.
blocks: removing blocks from gnuradio-core.

delay, rms, packed_to_unpacked, unpacked_to_packed.
blocks: fixing use of packed/unpacked from gr-blocks in QA code.
Merge branch 'master' into next
Merge branch 'next' of gnuradio.org:gnuradio into next