Speed and Visulization Improvements

This release contains a significant speed up for timeseries functionalities that involve integrating an SED (the ia, cc, kn, and user models) by replacing an integration with a rectangular sum approximation. Time series data generation wall clock time still scales with the number of pointings, but the process happens ~1,500 times faster now.

This release also contains a new function for visualizing the metadata of a simulated dataset as a corner plot of 1D and 2D histograms.