basic test for the MQN descriptors

git-svn-id: svn://svn.code.sf.net/p/rdkit/code/trunk@2427 a5045d30-4826-4484-9c7f-6e55a06ddc77
remove the irritating "ld: warning: path ..." message on the Mac

git-svn-id: svn://svn.code.sf.net/p/rdkit/code/trunk@2428 a5045d30-4826-4484-9c7f-6e55a06ddc77