MSPT: new submodule of Isoplot, able to analysis "pascal triangle" sample to validate experiment. (ref. Millard, Pierre, et al. 2014. “Isotopic Studies of Metabolic Systems by Mass Spectrometry: Using Pascal’s Triangle To Produce Biological Standards with Fully Controlled Labeling Patterns.” Analytical Chemistry 86 (20): 10288–95. https://doi.org/10.1021/ac502490g; https://github.com/llegregam/PascalTriangle)