Merge branch 'maint'
docs: removing old Doxygen groups (radar and usrp(2)).
docs: swig_docs don't look at operators when building Python documentation.
docs: another try/except/rerun spot.
Merge branch 'nosync' into maint
docs: another hack to check for errors and retry when building the swigdocs.
docs: another recheck point in the siwg_doc code. If a parse error happens, try rereading up to 3 times.
build: have swig_doc catch the exception when the xml parsing fails on a not-complete file.
The method sleeps for a second and tries again 3 times before fully failing. This seems a bit crass...
build: not going to work. Removing changes to cmake files and no sync call.
build: maybe towards a better way of getting Doxygen docstrings to build with -jN.
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