Matthew Brush 595b445984 Improve Doxygen support in Autotools build system
* Add `m4/geany-doxygen.m4` file
* Support `DOXYGEN` environment variable setting which Doxygen to use
* Support `--enable-api-docs` to activate building Doxygen docs
    (off by default)
2014-04-26 23:29:43 -07:00
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