Keep only one doxygen file. We keep the file build by Regis as it works both...

Keep only one doxygen file. We keep the file build by Regis as it works both with Eclipse and with perl script, however we rename it to have a config file name that match the script name.

doc/dev/dolibarr-doxygen.doxyfile

-# Doxyfile 1.6.1
+# Doxyfile 1.5.5
 
 # This file describes the settings to be used by the documentation system
 # doxygen (www.doxygen.org) for a project