ASP printer and quotes

[Bart Bogaerts]

Recent changes in printers have caused the ASP printer to print quotes around identifiers,

for example go("left") instead of go(left).

This breaks several of the existing visualisations that reuse the identifiers.

Either we should roll back the printer or fix the visualisations.

[Broes De Cat]

Probably because the printers should in fact never use print methods of the internal objects, as these are only intended for debugging. Solution: printer should not use the print of domainelement.