Resolving regressions in SMSD - it seems to be that the existing code won't match a aromatic double bond with an aromatic single bond (i.e. they both have to be single).

Change-Id: Ib47b2aa3d17649424a53bfeddafa10cee427acca
Signed-off-by: Egon Willighagen <egonw@users.sourceforge.net>