Added the results of the multi files test (as unit test) using the test data of the multi files test as provided by Jeremey.Related to Issue [MWDAM-1666]
Added a multi files test using the test data of the multi files test as provided by Jeremey.Is also part of review for Issue [MWDAM-1666]Related to Issue [MWDAM-1673]
Adapted the test data to the new file (slopelayers.csv instead of locations.csv) and adapted the value for x_offset.Is also part of review/correction for Issue [MWDAM-1666]Related to Issue [MWDAM-1673]