Data entry improvements

[hstaige]

Addressing Issue #4, decoupling the unpacking of data entry widgets from the validation of the data in those widgets. This allows for programmatic data entry to use the data_entry.templates rather than having to manually check field names and formatting.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 72.38095% with 29 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
radbase/data_entry.py	72.38%	29 Missing ⚠️
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Files with missing lines	Coverage Δ
radbase/data_entry.py	37.57% <72.38%> (+2.77%)	⬆️

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