"state" terminology in descriptions

[zepumph]

From #184, I feel like there are a fair number of places where the word "state" is being used, but in general it is pretty vague, and feels like a catch-all for "description" or something like that. Could we discuss potentially using terminology that is more specific to the use case?

Examples:

• getQualitativeConcentrationState returns a string. I'm not sure what "state" is trying to refer to right now. It is filled in to the stateInfo var in MolarityAlertManager. What is the different between a description in general and a "state" description? Are all state-related descriptions marked as such?
• ConventrationDescriber.lastSaturationState has similar issues in my opinion. On its own it makes sense that it is keeping track of the last value of model saturation, but again state seems vague, and like there could be a more specific word. Perhaps lastSaturationValue or previouslySaturated (the latter would likely require some logic change).

What do you think @twant?

[twant]

Went through and changed some usages, or added more documentation explaining what is meant by "state". @zepumph would you like to review?

[zepumph]

That is looking really nice. Thanks!