Finetuning for LIN

This MR fixes binary search tuning in tune_local_threshold.py, finally yielding the same results as mete_tune_local_threshold.py in a fraction of the time.

Full tuning of the linear flavor now takes about 45s, yielding the following threshold distribution at an absolute threshold of 1000e:

In comparison, the meta tuning yields the following distribution in about 15 minutes:

Note that the meta tuning converges about 15 DVCAL too high (target value was 80).

Additionally, with this MR, most tuning algorithms now support scanning over all FEs in a single run. This finally makes the use of the new meta scripts meta_tune_threshold.py as well as meta_tune_threshold_and_tot.py for full tuning of the full chip possible.

Furthermore, it fixes #269 (closed), #291 (closed), #303 (closed) .