Refs #10201. Autofill two theta in refl_gui.

This commit causes CalculateResolution to fetch a value for two theta
and then place it into the table.

Also, the "run" workspace is a duplicate of a TOF workspace, so it is
now named "_run" so that it can be cleaned up by quick.Cleanup().
Refs #10201. Support single value logs in CalcRes.
Merge branch 'feature/10201_calc_res_improvements' into develop