Implement rudimentary lipid-soluble substance half-life support

[dgets]

While the formulas for the actual dispersal of the lipid soluble metabolite from the adipose tissue (see issue #13) are still eluding me, it may be useful to implement a much more rudimentary view. I was thinking of one that goes through the past intervals between dosages, and if the recent one(s) have been less than the full 5.7 half-lives apart, it could at least notify the user that it will be taking longer than the standard half-life. On the other hand, if usage has not been as frequent, it could inform the user of the target date where the metabolites will be cleared, or if they have already been cleared. Along with, of course, a warning that these results are based on an experimental algorithm, and not to trust them in any sort of vital or important situation.