Implement statistics handling from NCA results

[billdenney]

Many types of statistical analyses are useful following NCA. It would help users to setup statistical methods to support common tasks. Three initial concepts within bioequivalence studies are:

• Handle typical bioequivalence
• Handle narrow-therapeutic index drugs (like https://www.accessdata.fda.gov/drugsatfda_docs/psg/Warfarin_Sodium_tab_09218_RC12-12.pdf)
• Handle highly variable drugs (like https://www.accessdata.fda.gov/drugsatfda_docs/psg/Progesterone_caps_19781_RC02-11.pdf)