qtgui: fixed issue preventing gr-qtgui build if Python-dev is not installed (ENABLE_PYTHON=False).
digital: typo fixed to "sps" (samples/symbol).
volk: clang/linux/avx fix
cmake: findIce fix (search $CMAKE_INSTALL_PREFIX first for source installed 3.5 needed for clang)
runtime: install compiler information volk: install compiler information, output timing in ms, add benchmark mode (run all kernels even if only generic is available)
cmake: adds compiler info to gnuradio-config-info and removes use of csv file.
volk: adding constants from cmake into volk. Access through new volk-config-info app (similar to gnuradio-config-info).
volk: added volk_list_machines and volk_get_machine to get information about the available machines on the platform. Available through volk-cofig-info.

Fixed volk- and gnuradio-config-info to catch exception when bad option is passed to it.
Merge branch 'cpu_profile'
Merge branch 'maint'
Merge branch 'master' into next
blocks: bug fix in tagged_stream_to_pdu which was causing memory corruption and missing/zeroed trailing ends to pdu data vectors
Merge branch 'maint'
Merge branch 'master' into next