Detect and retry wsclean divergence error #154
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In some fairly rare instances wsclean diverges during cleaning. However, a call back function is supplied and evaluated against the output logs from a wsclean command, and if a line of output has something to the effect of
Peak found at X kJyaCleanDivergenceErroris raised.This is a pretty simple attempt to capture that exception, and rerun wsclean with a larger image size and lower major gain. It is not bullet proof by any stretch, but it could help the occasional error where we have a bright source outside the field-of-view for a particular beam.