Scale AtomRadius in RadicalGenerator

Change-Id: I38f932505ba215e241e5732bf58f015c0e01bb79
Signed-off-by: Egon Willighagen <egonw@users.sourceforge.net>
Changed the layout of radicals to have a smaller gap between them.

Updated radical spacing

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