Remove TechLifeFrac constraint.

While editing the most recent revision of our yet-to-be-published paper,
we realized that having the separate TLF constraint was not strictly
necessary.  Originally it might have been meant to save generation time,
but that was perhaps a mistaken micro-optimization.  With this commit,
Temoa now

 * Calculates the TFL ("TechFracLife") for all process time periods
   (p,t,v)
 * Removes the TLF constraint
 * Utilizes the TFL for all processes via the Capacity constraint.  Note
   that this will usually be a null operation (i.e. times 1).
Update for Coopr API churn

Also, remove mistakenly committed comment.