fix sf.net issue282

git-svn-id: svn://svn.code.sf.net/p/rdkit/code/trunk@2376 a5045d30-4826-4484-9c7f-6e55a06ddc77
part of fix for issue 260

git-svn-id: svn://svn.code.sf.net/p/rdkit/code/trunk@2377 a5045d30-4826-4484-9c7f-6e55a06ddc77
update release notes

git-svn-id: svn://svn.code.sf.net/p/rdkit/code/trunk@2378 a5045d30-4826-4484-9c7f-6e55a06ddc77
efficiency

git-svn-id: svn://svn.code.sf.net/p/rdkit/code/trunk@2379 a5045d30-4826-4484-9c7f-6e55a06ddc77
update release notes

git-svn-id: svn://svn.code.sf.net/p/rdkit/code/trunk@2380 a5045d30-4826-4484-9c7f-6e55a06ddc77