Correcting conversion glitches in SP800-53A content

[wendellpiez]

Committer Notes

Issue #101 identified some errors in data conversion of SP 800-53A contents (assessments info, new parameters); this commit corrects these along with a couple of others.

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[david-waltermire]

The whitespace reformatter provided here is a partial solution to usnistgov/OSCAL#1183.

[david-waltermire]

LGTM. Thanks!