docs: updating build dependency and building instructions.
Removed whitespace and added dtools/bin/remove-whitespace as a tool to do this in the future.
The sed script was provided by Moritz Fischer.
Fix some minor warnings.
docs: adding more info to the doxygen manual's build guide.
Merge branch 'master' into next
Conflicts: config/grc_volk.m4 gnuradio-core/src/guile/tests/gengen_ctors.test gnuradio-core/src/lib/Makefile.am gnuradio-core/src/lib/general/.gitignore gnuradio-core/src/lib/general/Makefile.am gnuradio-core/src/lib/gengen/.gitignore...
Merge remote branch 'tom/safe_align'
Merge branch 'maint'
docs: setting up ability to link to example files in the Doxygen manual. Using the PFB channelize.py as a test.
Merge branch 'master' into safe_align
Conflicts: gnuradio-core/src/lib/filter/gr_fft_filter_ccc.cc gnuradio-core/src/lib/filter/gr_fft_filter_fff.cc
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