gr_uhd: Quick fix for make distcheck failures if UHD is not installed.
uhd: update notes in grc blocks for addressing scheme
uhd: reverting tag changes on uhd single usrp source, there seems to be issues with the work() logic
uhd: removed default value chan=0 in the cc files
WITH_INCLUDES must be last
uhd: replaced CFLAGS with CPPFLAGS variable, and fixed swig args FIXME
uhd: default channel params to zero for single source and sink blocks
uhd: added libdir to UHD CFLAGS (shared by lib and swig)
Swapping out preset keys until I work out some of their issues.
Merge branch 'tagging' into next
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