Lots of changes!

* Added in functions to calculate length and Deborah number
* Revised the equilibrium moisture function so that it can eliminate
    erroneous data taken early in the experiment.
* Set the kF functions to return a matrix of values rather than just
    printing out their results.
* Make the kF functions use the value calculate at the previous time as
    the initial value instead of some user-supplied value for improved
    convergence.
* Added functions to determine when the "good" data starts.