Adding GENDF Capabilities to ENDFtk#73

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nathangibson14 wants to merge 17 commits intomainfrom

Commits on May 28, 2020

Using BaseSection and inheritance.
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Commits on May 29, 2020

Added tests for GendfSection, GendfMaterial. Also fixed GendfSection.
nathangibson14
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Removed placeholder parse-gendf. Added testing for GendfTape and updated GendfSection.test.
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Added file I missed last time.
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Commits on Jun 1, 2020

Added implementation of GendfBase.
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Commits on Jun 3, 2020