Implement add/remove/modify support for specific isodose levels

[GoogleCodeExporter]

Currently, the isodose levels are fixed. An interface needs to be implemented 
so that users can modify the isodose levels that are displayed.

Ideally this code should be generic enough so that it can go into 
ColorCheckListBox in guiutil.py.

Original issue reported on code.google.com by bastula on 24 Nov 2010 at 8:14

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