Allow logtrapzexp to work on a non-uniform grid

The current implementation of the logtrapzexp function (performing trapezium rule integration in log-space) currently only works for a fixed grid step size. This MR allows it to work with an array of step sizes, which can be non-uniform.

The Grid class is also edited to allow marginalisation on potentially non-uniform grids.

A test suite for the logtrapzexp function is also added.

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• c96cd97a - Run black to fix formatting issues that break the pipeline

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mentioned in commit 1e54ec66

merged

changed milestone to %1.1.4