Design more suitable abort criteria

[andgdk]

Description

Currently, the the IFTA terminates after a given number of iteration regardless of the performance.

The current algorithm's performance is not measured.
However, it seems to lack improvement already after a hand full of iterations. Some literature suggests that hundreds of iterations might be required for optimal performance, as I recall. It should be further investigated if this proves to be the case.

Better performance metrics and their potential implementation details could be explored.

Proposed solution

Consider a new abort criteria for the IFTA. Explore how to measure performance (e.g. uniformity error, diffraction efficiency)

Alternatives considered

Keep the simple hardcoded abort criteria.