the export argument of an accessible allows now to specify an other
external name than the attribute used internally.
export=True (default, use defined name, or prefix with '_' when
name not in predefined list)
export=False (do not export)
export=<any string> (special cases only)
Change-Id: I6c6669cd502d9d6fd3aa40091673e5554fd961bd
Reviewed-on: https://forge.frm2.tum.de/review/19664
Tested-by: JenkinsCodeReview <bjoern_pedersen@frm2.tum.de>
Reviewed-by: Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>
Markus Zolliker
feba5a1400