Update Doxyfile to recent doxygen (#1227)
Update Doxyfile to recent doxygen (#1227)

Drop obsolete settings, update config doc

Fixes doxygen warnings about obsolete tags.
AMICI-developer/AMICI,FFroehlich/AMICI,FFroehlich/AMICI,FFroehlich/AMICI,FFroehlich/AMICI,AMICI-developer/AMICI,AMICI-developer/AMICI,AMICI-developer/AMICI