add group of tables

Fix: rename fields "type" to "format" in llx_extra_fields
Fix: group constants tables

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.

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.

add extra fields table