EpileptorWithPermitivity to Epileptor

In release 1.3, there was a model named EpileptorWithPermitivity which got removed in release 1.4.
In case we do nothing, reloading on the Burst page old simulations (which were executed with model EpileptorWithPermitivity), will get the default model filled in - which is wrong.

The Epileptor model has different ranges and default values for parameters, although the visible params are similar to the ones in EpileptorWithPermitivity.
It is highly probably that transferring the old EpileptorWithPermitivity parameter values with direct value into the Epileptor params with the same names, will generate Nan, or very different results. Some params, do not have a visible correspondent.

So, we decided to only change the Model (from EpileptorWithPermitivity into Epileptor), but let the parameters of the Epileptor be the default ones, rather than trying to find a correspondence from the old values.

Tim's opinion is that not may user have tried this model anyway.