Added method Tie_Point_Grid.calc_overall_stats() + tests to compute overall...

Added method Tie_Point_Grid.calc_overall_stats() + tests to compute overall statistics from all tie points found.

Signed-off-by: Daniel Scheffler <danschef@gfz-potsdam.de>
5 jobs for v1.7.0 in 4 minutes and 53 seconds (queued for 15 minutes and 25 seconds)
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