also prevent to mix leaf-like and inner content in <AS>
This fix https://github.com/simgrid/simgrid/issues/116 just like we
fixed https://github.com/simgrid/simgrid/issues/296 earlier, that did
the same for <zone>
Also, really allow to use bypassZoneRoute in place of bypassASroute.
I guess that this one is simply untested :(
Having orphaned elements such as bypassZoneRoute when no tag declare
it as a potential content triggers a bug in flexml preventing the file
generation to proceed
Use of uninitizalized value in $instates{$tag}
:( :(
