Spielwiese

Thanks to martin's commit, one can now build the polymake interface with --enable-polymake

I updated the gfanlib and polymake interface to their latest versions as of now. However there is still one more thing to be done, namely a correct error message if polymake.so is loaded before gfanlib.so

http://schmetterhemd.mathematik.uni-kl.de:31111/project.html?projectId=Singular&branch_Singular=polymake_dyn_module