Pyabm

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New Features
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- Make GDAL an optional dependency.
- Deprecate ArcGIS support.
- Allow using SSL for email sending.
- Allow setting batch_run_python_path to none (disables the threaded batch run
script).
- Add validate_string_list function to rcsetup.py.

Bug Fixes
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- Ensure package data (rcparams.default) is correctly installed.
- Only attempt a git diff when in a git repo.

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- Prepare for Python 3.
- Add rc parameter to force ArcGIS or GDAL/OGR (though ArcGIS usage is
currently disabled until a future version of PyABM).
- Store PyABM version in __version__ in __init__.py
- Set git, Rscript, and tail binary paths to None as default.
- Add example pyabmrc files: pyabmrc.linux and pyabmrc.windows
- Move git functions into PyABM utility module
- Other miscellaneous bug fixes

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- Release for PIRE 2011.

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- Release for PIRE 2011.

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- Release for PIRE 2010.

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- Release for PIRE 2009.