Engine deck conversion update

[jkirk5]

Summary

Testing of engine conversion was broken, never actually checking data. Converter utility as it currently existed produced different results than what was actually present (different number of generated points).

• Reverted some converter settings to their original values, which can reproduce our original Aviary engine decks (number of generated points in those decks was intended behavior)
• Added in optional rounding of engine deck values when converting. Engine decks inside models were either re-converted if old data still available, or just re-formatted & rounded without otherwise changing data for better human readability.
• Updated tests that changed with these new rounded engine decks. Typically changes are extremely minor and only break very tight tolerance tests

Related Issues

• Resolves #

Backwards incompatibilities

Will very slightly change results for any model that uses the built-in engine decks. This PR may want to wait for 0.10.1+

New Dependencies

None