Doxygen-Plugin won't run

[SunSailor]

Under circumstances I can't define exactly, the doxygen plugin doesn't run here. Paths are correct, but it seems, that the conversion from req.args[''] to string doesn't work as expected here (Or better said, as expected, as I don't understand why it is running elsewhere at all). Nevertheless, I've attached a patch to get it running here. This patch is also adding png support to the plugin, allowing it to show the embedded images, as I had the same kind of problems with the other patches (See #119).

[SunSailor]

This patch also adds a new configuration attribute "index", where you can choose which page shall be the root page (as main.html is only created with 'GENERATE_TREEVIEW'). It has to start with a slash

[doxygen]
path = /path/to/documentation
index = /index.html