more bug fixing for TinyTim psfs   * last commit was premature.   * this version is tested end-to-end with the WFC3IR     test flt file and a grid of fakes.   * still untested : precision of planted fake positions      and fluxes.
more bug fixing for TinyTim psfs
  * last commit was premature.
  * this version is tested end-to-end with the WFC3IR
    test flt file and a grid of fakes.
  * still untested : precision of planted fake positions
     and fluxes.

srodney/hstfakes