Introduction of FIXME - tests 

Negated tests of 'future functionality' / bugfixes. These tests capture the current (failing) behaviour and enable tracking of changes.
 * Introduction of FIXME keyword: "...XPECT FIXME ...." or ignored version "... XPECT ! FIXME..."
 * fixme-flag in model class: org.xpect.XpectInvocation
 * implemented negated behaviour for fixme-flagged Tests.