Compiles and run !

Great news : the parrot code with modified object allocation targetted for GMC is not only compiling correctly (it has been for some days now) but running without segfaulting, which is a great improvement !
make test reports 85% of tests ok (more details here : make test output), so this means that there are still some important bugs around (but in heavy modification of such complicated source, the contrary would have been quite surprising !).