More dia props stuff

[James Henstridge]

I have added props support to another object type -- the group object.

This means that if you select a few objects that implement the properties
interface, you can bring up a properties dialog that shows the
intersection of their properties (maybe this should do the union??).

As an example, you can select two flowchart boxes, group them (right
click, objects, group) and set the border colour on both at the same time.

James.

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