Helpers shared across the package.

save_figure.m   set the figure format and save it as a .png file
jbfill.m        fill a region with a color in a graph
patchline.m     plot a hairline graph
invChol/        fast inverse of a symmetric positive definite matrix through
                its Cholesky factor, which the general_model samplers call;
                run_to_compile_and_test.m compiles invChol_mex from
                invChol_mex.c. invChol.m is a plain MATLAB stand-in the
                samplers pick up where the MEX is not built, so they run
                either way

jbfill.m, patchline.m and invChol/ are third-party code, as is the logdet
function inlined in the general_model samplers. They are redistributed under
the licenses in this folder.
