[tests] Share your ideas here for tests in map2loop!

[lachlangrose]

This is an ongoing issue to keep track of tests that need to be added to map2loop

• intrusions: conformable stratigraphy with a dyke running through. Expected result is the contacts of stratigraphy near the dyke are ignored
• colour maps: test where clut file doesn't exist, where it is missing units, where it has invalid colour codes and where it is valid
• missing files: missing files for all inputs of m2l, either raise FileNotFound exception or continue if the file is not critical.
• faults: make sure that the basal contacts are cropped near the faults, displacement calculation is relevant

[AngRodrigues]

• add tests for save into LPF. Should check the headers, and column dtypes as well.

[AngRodrigues]

• move from having tests that use data from Loop server, as sometimes connection to GA times out and test fails

[AngRodrigues]

Fixed by skipping the test if server not available.