Allow logtrapzexp to work on a non-uniform grid
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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.