Survey metadata change after write/read (southeast corner)

[kkappler]

This is why test_aurora_processing.py is failing in mtpy (tests/processing/aurora/test_aurora_processing.py)

As a workaround I added the following lines to both TestProcessRRCompare and TestProcessSingleStationCompare in mtpy-v2.

To make the test fail again, when investigating this issue, search strings from the following snippet:

logger.error("Forcing southeast corners to match")  # see mt_metadata issue # 253
tf.survey_metadata.southeast_corner = self.tf_obj.survey_metadata.southeast_corner