Refs #8131 Swap to make beam width non mandatory.

We can try and get it from the instrument in the workspace.
Refs #8131 Fix issues with running CalcCorr.
Refs #8131 Validate input from formula.
Refs #8131 Swap to simply auto load the file at the beginning.
Refs #8131 Attempt to get the beam width from the workspace.
Merge branch 'feature/8131_calc_corr_update' into develop