Fix issues from #41, #35, #44

[j9recurses]

Removes columns buttons from the UI that are ID fields.

[j9recurses]

Closes issues #35, #44 relating to charting issues.

For #35- Column Display issues:
we are just taking the top 8 groups when displaying by rows. We could do something fancier where we look at count for each value in column then display however many fall within 50% of the max value (theres a lot different ways to approach this.

For #35- Displaying Group By
To reduce the dimensionality:
First, we remove any column group that is empty.
dataset = [ [x,x,x], [x,0,0,0], [x,0,0,1], [x,0,0,0] ]
in the above, items at index 1 and 3 are removed because they are empty

Then, we look a given row for a header. if the row has a sum of zero, we remove the row.
If not zero, then look at threshold --> 1% below the maxValue in the dataset, remove the row.

[jasonlally]

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