EQSANS: make sure sensitivity calculation works w/beam center

[Mathieu Doucet]

Clicking the "Compute Sensitivity" button on the EQSANS UI doesn't work if the option to compute the beam center is turned on at the same time.

[Mathieu Doucet]

Re #7749 Fix issue with setup

Changeset: 60c66708f5b38e5dadf3d7c153bb26e6a57dd060

[Mathieu Doucet]

Re #7749 Fix issue with output sensitivity

Changeset: e3bc6e1175af1aa355573e40e6e8d1a0de768cb4

[Mathieu Doucet]

To test:

• Start the EQSANS reduction UI.
• In the Tools menu, turn debug mode ON.
• On the Detector tab, check the "Use beam finder" box, then enter a run number in the data file box under it (run 1466 from the systemtests would work).
• Check the "Perform sensitivity correction" box, then enter a run number in the sensitivity data file box (run 4061 from the systemtests data would work well here).
• Check the "Patch sensitivity" box.
• Click the "Create sensitivity file" button.
• A new workspace named 'sensitivity' should appear in the ADS and there should be no error.

[Jay Rainey]

Testing

• Computing sensitivity now works if the beam center is turned on at the same time.
• Tested on Ubuntu 12.04

Code review

• Clean code with no visible issues.

[Jay Rainey]

Merge remote-tracking branch 'origin/feature/7749_fix_eqsans_sensitivity'

[Stuart Campbell]

This ticket has been transferred to github issue ​8594