Added a wavy bond type for unset stereobonds.

Change-Id: Ied54df213317d58d19f5e9c56b78ecbc18c16f8b
Signed-off-by: Egon Willighagen <egonw@users.sourceforge.net>
Added an option to define a maximum drawable ring size for
the aromatic ring representation. Added dynamic scaling
based on the ring size for inner bond elements.

Change-Id: I33cacb2a898fdcfa35fd634f175a36dfbb1dc909
Signed-off-by: Egon Willighagen <egonw@users.sourceforge.net>
Merge remote branch 'upstream/master'