Update towards automatic building on dp.samba.org:

Update towards automatic building on dp.samba.org:

Remove features not supported by Doxygen 1.2.14 on RH7.3.

Remove dependence on dot tool, which is apparently not in Redhat, and
doesn't produce very interesting results for C code anyhow.

Make Doxygen --quiet to support running from cron.

Remove references to files which are gone from Samba
(CodingSuggestions).

Put HTML output in the right directory.
(This used to be commit 5904260f4842adb36e30b36b37cf7e6ed1bc03f2)