main script updated so that whenever a json object is expected and not found the default would be {}. So we do not need to have e.g. empty failures. Changes reflected also in several ropologies

CoreObject updated with methods to calculate the giver and the receiver. Methods in test mode, not called by any object currently

methods of interrupting and reactivating an object were passed to generic ObjectInterruption. This will make the interruptions more flexible

This reverts commit c6fa76ac.

Revert "Remove try/except that can hide programming errors"

This reverts commit 2ce01ae4.

Revert "Output queues in results"

This reverts commit 7dc0cc78.

Revert "Raise an error when attempting to use an invalid scheduling rule on a queue"

This reverts commit 7bca22bf.

Revert "display gantt by job & by station"

This reverts commit 1094e881.

This is mostly to have an id in the result json and be able to display it as a
station for gantt by station

This script can be used to debug a json saved from the GUI

This reverts commit c6fa76ac.