Add more Pandas-based Checkpointing and Save/Load Functions#16

Draft

ilumsden wants to merge 10 commits intollnl:developfrom

TauferLab:pandas_save_load

Commits on May 28, 2021

Adds Pickle reader/writer
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Creates Readers and Writers for CSV and Excel for checkpointing
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Changes keyword argument parsing for to_hdf and from_hdf to use **kwargs
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Changes keyword argument parsing for to_hdf and from_hdf to use **kwargs
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Removes manual parsing of kwargs in HDF5Reader and HDF5Writer
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Gets the CSV and Excel Readers and Writers working by manually picling nodes and converting string representations of lists back to lists
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Adds the necessary dependencies for Excel reading and writing to CI
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Adds a Python verison guard to the use of ast.literal_eval for pickled nodes because of the lack of bytes type in Python 2
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Commits on Jun 24, 2021

Updates CSV, Excel, and Pickle readers and writers to account for changes merged from develop
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Commits on Feb 9, 2022

Merge branch 'develop' of github.com:LLNL/hatchet into pandas_save_load
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