File Management

Rename some files:
- fminconScriptLoop.m --> fminconLoop.m
- LoopThetaInitial.m --> fminsearchLoop.m

Deleted unnecessary files
- fminsearchData: practically identical to Tumor Data (column)
- costsMatrix.mat, data.mat, optimTool.m: originally used for testing
purposes, can now be removed

Updated ode.m
- uses ode45 to generate numerical solution of differential equations
specified in simulODE
- updated to work with latest ode model
- uses nargin to check for number of input arguments --> can be used
with both 0gy (no 4th argument: probability of survival) and 8gy (4th
argument: probability of survival) datasets