+ [Shamus 2013-08-11]
+ - Add Arc [Shamus 2013-08-14]
+ - Fix snap to grid to allow picking up of handles when they are not on a grid
+ point. [Shamus 2013-08-18]
+ - Add OSD routines so they don't have to be implemented in Objects [Shamus
+ 2013-08-24]
+ - Mirror tool (started, needs actual mirroring implementation) (Rotate tool is
+ also done :-D) [Shamus 2013-09-01]
+
+
+Things to Ponder
+----------------
+
+Grouping items on different layers currently makes the items *not* on the current layer disappear. Not sure how this should be handled... Maybe we should honor the top level Container's attributes, and not the attributes of the contained objects?
+
+
+Bugs
+----
+
+ - Add new dimension doesn't honor the scale parameter set by user
+ - Dimension object prevents system from finding intersections when near or on
+ object intersection
+ - Pen marker doesn't set attributes on the highlighted part of the group.
+ - Can't move objects to other layers
+ - Dimension lines extents aren't properly taken into account when printing