Make CalculateResolution output TwoTheta.

Refs #10198.
Update the value of TwoTheta in refl_gui's table.

Refs #10198.
Remove debugging logging.

Refs #10198.
Fix CalculatResolution regression and update docs.

Refs #10198.
Merge remote-tracking branch 'origin/feature/10198_place_value_of_twotheta_into_refl_table'