Synchronise bits in IntArrayFingerprint, old pre-maven patch (pull/34).

Signed-off-by: Egon Willighagen <egonw@users.sourceforge.net>
Double check locking of chem object builders. Follows on from a jonalv pre-maven patch (pull/34).

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