docs update

git-svn-id: svn://svn.code.sf.net/p/rdkit/code/trunk@2483 a5045d30-4826-4484-9c7f-6e55a06ddc77
add and test support for BRICS in the cartridge

git-svn-id: svn://svn.code.sf.net/p/rdkit/code/trunk@2484 a5045d30-4826-4484-9c7f-6e55a06ddc77