Feature/issue 119

[nlenssen2013]

Github Issue: #119

Description

Specific code addition for GPM files. Need to loop through the variables to change the dimensions from phony dimensions
to what the dimensions are in the attributes.

Overview of work done

Loop through each variable, check if it's a variable that might be deleted if a variable subset is asked from the user. Get the DimensionName in the attributes, if the DimensionName is unique, create a new dimension and set the dimensions of the variables to the true names.

Overview of verification done

Test written to check that none of the variables have a "phony" dimension.

Overview of integration done

Explain how this change was integration tested. Provide screenshots or logs if appropriate. An example of this would be a local Harmony deployment.

PR checklist:

• [x ] Linted
• [x ] Updated unit tests
• [x ] Updated changelog
• Integration testing

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