Included in this release are a number of bug fixes and new features,
including the following:
* Support for Sentinel1A TOPs mode processing.  Example input files
can be found in examples/input_files and documentation can be found
in the documents on the UNAVCO website where you download ISCE.
* Generalized downloading of DEM and Water mask downloaders.
    - Other online sources can now be added more easily.
* Updates to Sensor readers
    - Bug fixes to ERS reader to handle line duplication
    - Support for RISAT raw data as well as RISAT SLC
* Updates to zerodop.topozero
    - Can now generate products for terrain correction of GRD products
* Added new orbit interpolation method (Legendre)
    - For dealing with poor orbit metadata - some cases of RS2, RISAT-1 etc.
* Bug fixes for many framework related elements
* Unit tests for many elements
    - to run the  unit tests (found in the top level "test" directory),
      use "scons test" after "scons install".
    - other unit tests will be added to the top level in future releases.
* Exposed wisdomGenerator.py application to the user who is interested
in full numerical repeatability in the fftw computations. Important for
regression testing, but perhaps not so important otherwise.  FFTW
optimizes the fft estimator each time fftw is used, which means that
the noise on the estimator is not repeatable.  Wisdom forces fftw to use
the same precomputed estimator "path" for every fft of a given size, at
the possible cost of reduced speed optimization. If you choose to use
"wisdom", do the following:
    - run the application wisdomGenerator.py to create a file named
      isce_wisdom.txt.
    - Set an environment variable named WISDOM_FILE equal to the path
      (including the file name) to the isce_wisdom.txt file.