several testcases fail because of #domain

[peschue]

As the new version of gringo does not support #domain we can no longer use it in XHAIL.

Therefore the following examples/test cases need to be adapted, or XHAIL needs to transform #domain into something new that is understood by gringo.

ec.lp, phone4_abd.lp, phone4_complex.lp, phone4_ded.lp, phone4.hardest.lp, phone4_hard.lp, phone4_ind.lp and reaction.lp all fail with a lexer error (unexpected #domain)