corrections to inserting from file

Added insert from action to import file contents from another file

Insertion point calculations fixed, make pasting objects cause the new objects be selected.

Added new subfile dialog

Fixed additive selection; use a green selection area background instead of blue when selecting additive; selection area borders now appear black on bright backgrounds; single additive picking an already-selected object un-selects it.

Converted combo boxes in add object and new part dialogs to radio buttons. Added a convenience widget which makes it easier for me to add groups of radio buttons. My first widget.. :')

Cleanup and some restructuring

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mercurial