Integrate building docs using Sphinx and Doxygen into the makefile

proper. Enabled using --use-sphinx and --use-doxygen options, both of
which default to false. If Sphinx isn't enabled, the ReST sources are
copied directly (a case where having a very readable source format
comes in handy...)

The reference manual (either Sphinx processed into HTML, or the raw
source) and the Doxygen output (if enabled) are copied into the doc
directory upon install on Unix. Currently not done on Windows, the
install target is fairly bogus there currently, and hasn't been tested
in some time.

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