Incremental Updates / Housekeeping

Renamed costResults data files
- costResults_u87_x(1-f0): costs results from brute force trying
4,459,000 different parameter values to fit pop_u87_0gy, feedback =
p0/(1+h*x*x(1-f0))
- costResults_u87rad_x(1-f0): costs results from brute force trying
4,459,000 different parameter values to fit pop_u87_8gy, feedback =
p0/(1+h*x*x(1-f0))

eqn0, eqn1, eqn2
- eqn0: differential equation for x (x_total) and x0 (currently
commented out)
- eqn1: diff. eq. for f0 and x1 (currently commented out)
- eqn2: diff. eq. for f2 and x2 (currently commented out)

euler4 renamed to eulerTest
- just a test-bed

euler5 forked to 2 versions:
- euler5.m: takes all parameters as individual arguments
- euler5theta.m: takes all parameters as one argument
theta=[p,h,f0_i,v,d1,d2,r]

Renamed Optimization Summary.xlsx to Parameter Summary.xlsx
- Made some important formatting changes
- Added data for final ODE model