Review code in PSE Isocline

This task should be started only after TVB-2643 is completed.

Lately we realized that PSE Isocline and PSE Discrete don't really work in the same way, and it would be healthy if they did.

In short terms, PSE Isocline needs a list of all range values in the interval before it iterates through the operation, while PSE Discrete does not.

The suggested method to do this review is the following:

• Start bulding a new Isocline Adapter and a new Discrete Adapter where the code should rewritten in a clean manner, using the same principle for both
• When this is done and it works, the old adapters will be removed and the new ones renamed with the names that the old ones had.