Move b4step into advanc to solve aux array filling
#303
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This moves
b4stepso that it is called beforeqadand gauges are recorded so that theauxarray can be filled properly if needed, e.g. whenauxis time dependent. The bug can be demonstrated by this modifcation. This also fixes a bug in clawpack/geoclaw#653, but that source needs to be modified in a separate PR.FWIW the new tests from #298 pass except for the adjoint tests, which are problematic anyway.