Basic market research model with absorption

[pksohn]

Begin on a model class for market research. This should include functionality for:

• All "data collection" steps (i.e. registering status columns on parcel table)
• Actual market research calculations (e.g. absorption)
• Filtering input into feasibility step
• Adding information into table that gets passed to feasibility step

[pksohn]

Merged in #51.