hw5
part A done unittests
started work on adapative code
finished adaptive step function...working on tests
fixed bug where two-step sol was compared to zero-step solution

This led to R being O(dt) as opposed to O(dt^(p+1)). When fixed, the
suggested error estimator tool works.
added some comments
had to change dt argument to a pointer for some reason
fixed R calculatuion. Using magnitude test

(x+dx )- (x+dx2) is not the same numerically as dx-dx2.
video writer works

using interp1d from scipy to interpolate the output onto the
specified (equispaced) frame times.
number of time steps in interval bar below
finalized the plotting parameters