New CNCS definition.

[AndreiSavici]

New CNCS definition according to mantidgeometry branch CNCS_2016B

To test:

Please merge mantidproject/mantidgeometry#79 as well

Fixes #16932

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Reviewer

Please comment on the following (full description):

Code Review

• Is the code of an acceptable quality?
• Does the code conform to the coding standards? Is it well structured with small focussed classes/methods/functions?
• Are there unit/system tests in place? Are the unit tests small and test the a class in isolation?
• If there are changes in the release notes then do they describe the changes appropriately?

Functional Tests

• Do changes function as described? Add comments below that describe the tests performed?
• How do the changes handle unexpected situations, e.g. bad input?
• Has the relevant documentation been added/updated?
• Is user-facing documentation written in a user-friendly manner?
• Has developer documentation been updated if required?
• Does everything look good? Comment with the ship it emoji but don't merge. A member of @mantidproject/gatekeepers will take care of it.

[peterfpeterson]

Looks about right. A few small issues:

• You changed filename conventions. The old one should be called CNCS_Definition_20160212-20160713.xml.
• This was not created by Michael Reuter. Please change the name in the file.
• Do you really mean for this to new one to change at midnight between July 13 and 14? That is a Wednesday to a Thursday (not a maintenance day) and I would have expected that they want a constant geometry for the run-cycle (starting July 1).

[peterfpeterson]

All the issues were addressed.