Changes

For RegTune, adds color-coded matrix of correlations among parameter vectors.
Also, this commit separates the three-dot panel plot into its own function.

For #910.

For clarity, renames figures in RegTune.

For #910.

Creates new function, setUpPreliminaries, in RegTune.
setUpPreliminaries calculates some basic quantities
that are used later.
As part of this refactoring, a number of functions
were moved from analyze_sensitivity_matrix to
set_up_dashboard_inputs.

For #910.