The following patch does the following:
* respect user's docdir,htmldir,pdfdir at configuration time (with user specified --htmldir, --docdir)
* install recursive for doxygen generated (lately doxygen creates a search directory)
* works for out-of-source directory installation
blitz-10-docs.patch
Closing here as this is proposed as a github PR already: https://github.com/blitzpp/blitz/pull/22/files