SEGYImport: Add segy-survey-coordinate-system and survey-coordinate-system

Adds the possiblity to override the survey coordinate system unit read from
the SEG-Y file and what unit is used for the survey coordinate system
stored in the VDS
9 jobs for !727 with feature/jorgen.lind/segyimport_survey-coordinate-system in 28 minutes and 11 seconds (queued for 2 seconds)
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