CEN,COM,lineup features
(depends on #317 (closed))
TODO:
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CEN means center of FWHM
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there is also PK (PeaK value)
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LAST_SCAN.CEN, LAST_SCAN.COM (?): retrieve max. position and Center Of Mass -
LAST_SCAN.move_to_cen(): moves to CEN pos. -
lineup scan: dscan + move to CEN