With this option, the entire level of modality depth 1 is explored and
all satisfying assignments are listed.

This should simplify writing the actual rule for GML.

Make some GMLMIP makefile rules as phony to enforce recompilation of
some dependency object files.

Remove this again before running tests.

The actual for GML is still missing.

They are replaced by make and make clean in the GMLMIP directory.

This avoids compile warnings and ensures correct behaviour for future
IFormula subclasses implementing a destructor.

It really is empty, while bsetMake creates a bset only containing True.

This avoids coalg from segfaulting.