Fermipy

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* Including 4FGL, interstellar emission model and isotropic templates files.
* Changing catalog.py to use 4FGL catalog
* Minor fixes to target_collect.py, lightcurve.py and gta.simulate()

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* Added fitting code to fermipy.diffuse module
* Improved fermipy.jobs to deal with analyses with multiple components
* Added capability to plot global minimum in castro plots
* Added spectra for dark matter decay to DMFitFunction
* Added code to split simulations into smaller batch jobs
* Added fixed shape lightcurve to correct TS_var computation

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* Added lots of documentation for the fermipy.jobs module.
* Minor changes to the fermipy.jobs module to work with the
dark matter analysis pipeline (dmpipe).

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* Patch release to get versioning working with GitHub release system.

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* The LogParabola, PowerLawSuperExponetial and Dark Matter SEDs have been added to the sensitivity.py script.
* There are a lot of additions to perform a stacking analysis. This can be applied for instance for the search of dark matter with a stacking analysis of Milky Way dSphs, Galaxy Clusters or other galaxies.
* It contains scripts to send jobs to SLAC Batch Farm and collect the results.
* It includes scripts and functions to perform all sky fits.
* It also fixes a few issues with glon and glat in the localization (225), and the wrong orientation of residual and TS maps (216)

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* Improvements and refactoring in the internals of the ``lightcurve``
method (see `156 <https://github.com/fermiPy/fermipy/pull/156>`_,
`157 <https://github.com/fermiPy/fermipy/pull/157>`_, `#160
<https://github.com/fermiPy/fermipy/pull/160>`_, `#161
<https://github.com/fermiPy/fermipy/pull/161>`_, `#162
<https://github.com/fermiPy/fermipy/pull/162>`_). Resolve fit
stability issues that were arising when the source of interest was
not significantly detected in a given time bin. Added options to
speed up source map calculation by rescaling source maps (enabled
with ``use_scaled_srcmap=True``) and split the lightcurve
calculation across N cores (enabled with ``multithread=True`` and
``nthread=N``). Add calculation of ``TS_var`` to test for
variability using method from the 2FGL.
* Updates to validation tools. Added MeritSkimmer script
(``fermipy-merit-skimmer``) for skimming ROOT merit tuples either
locally or on xrootd.