Remastered code to maximize utility..
Improvements:
	-All scenario parameters are now user-definable
	(e.g. incl num_of_years and index).

	-Parameters are now defined in a short runfile, which
	calls the model module, which contains the code. This way,
	we can create new runfiles for each type of analysis we wish
	to do.

	-The model module checks that Scenario parameters are
        properly set, now that we have added so many parameters.

Changes:
	-The historical data table needed to be truncated such that
	we have the same number of data rows for each index. The
	new table only goes back to 1982. Simulations using this
	truncated table are still returning highly similar results as
	before.

Future:
	-I plan to re-introduce a likelihood function which
	calculates the probability that Scenario 1 > Scenario 2.

	-At this point, it should be easy to mod this code to allow for
	blended investment strategies.

 	-It'd also be easy to turn the Scenario class into an
         iterable if one wished to do year-by-year analysis.