[DDI-SRG] [MRT] Model cleanup: Super class with unclear purpose

[Wackerow, Joachim]

DDICore_40_PIM-Classes-FormatDescription-PhysicalSegmentLocation
has no attributes, one association to ValueMapping, and one sub class, SegmentByText.

The purpose of PhysicalSegmentLocation is not clear.
It seems that PhysicalSegmentLocation could be removed and SegmentByText could have the association to ValueMapping.
See attached diagram.

Please review.

Achim

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