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**Added:**
* Plugin framework
* The find_gord_plugs.py bin file to find the plugins
* A script call common_examples.py shows a number of cases where various paramerters are varied and the affects on the spectrum
**Changed:**
* Gordeyev integral calculation moved to plugin directory.
**Removed:**
* mathutils.py removed and materials added to gord_default.py
**Fixed:**
* Collision frequency has been changed to radian's/second in the gord_default plugin.