Add a desktop file for the gui.
Update to version 0.94. This means:
- The theory of records replaces the theory of pairs
- Bug fixes (intervals, term data-structure, stack-overflows, matching,
existentials, distincts, CC, GUI)
- Improvements (SMT-Lib2 front-end, intervals, case-splits, triggers, lets)
- Multiset ordering for AC(X)
- Manual lemma instantiation in the GUI