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Tracking4D: Add config file parameter to specify planes that should not be used for the track seed

Annika Vauth requested to merge avauth/corryvreckan:excludeFromSeed into master

Tracking4D starts out by going through the list of planes, calls the first detector with a cluster on it reference_first and the last detector with a cluster reference_last. The track finding is based on a straight line between those two.

I have a case where the very first detector plane (a timing reference placed before the Mimosa telescope) has a much worse spatial resolution than the following planes used in the tracking. After experimenting a bit, I found that the track finding is much more successful if I make sure this plane is not used as reference_first, so that the straight line reference track can be constructed from two telescope planes instead.

To steer this, I've added a parameter exclude_from_seed to the config file.

Putting this here as a merge request in case you think it can also be useful for other users.

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