AttributeError: 'CMPGUI' object has no attribute 'active_epiunwarp'

Hi,

I installed the latest CMP version from github and tried to use it with EPD-7.3.1. I get the following error:

```
AttributeError: 'CMPGUI' object has no attribute 'active_epiunwarp'
```

when starting `connectomemapper`. Does anyone know what could be causing this?
