create aggregated scorecard

[TatianaBurek]

Describe the New Feature

*aggregate multiple scorecard on one. The scorecards for aggregation should have identical row and columns definition, The only differences are the models. The XML for hte aggregated scorecard should be the same except for

<plot_fix>
       <field name="model">

element where users should specify even number of models:

 <plot_fix>
        <field name="model">
          <val name="galwem"/>
          <val name="gfs"/>
        
          <val name="model1"/>
          <val name="model2"/>
        </field>

In this case two scorecards aggregated into one should be presented (galwem-gfs) and (model1-model2)
*

Acceptance Testing

Image for the scorecard should be generated

Time Estimate

Estimate the amount of work required here.
Issues should represent approximately 3 days of work.

Relevant Deadlines

NONE.

Funding Source

AF.

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Define Related Issue(s)

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• METplus, MET, METdatadb, METviewer, METexpress, METcalcpy, METplotpy

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