Implement regression tests for bidomain simulations with autotester

What does this MR do?

This merge request implements regression tests for the bidomain simulations using autotester.

• autotester/max_error.py was modified to be able to take into account different types of output files (.igb, .dat, ...)
• autotester/atc_template_bidomain.py was modified to run all regression tests previously run by carptests for bidomain simulations (module devtests.bidomain).
• autotester/atc_template_limpet.py was modified so that the paths it generates allow to run the tests from any location.
• A relative path in noground_bidom test case was changed to an absolute path.

Tests were run in the openCARP pipeline here

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