simplify Geneset configuration UI

[jingchunzhu]

• [ ] add number limit and "most similar" vs "most differential" to visible controls
• [ ] remove "Find Gene"

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Control edits:

• [ ] remove number limits
• [ ] add "find gene" to gene set filter (separate entry)
• [ ] sorting should be absolute diff (to pull) and then cohort diff (to view) -> same for CNV + Mutation, but the background is always the same

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Unsure:

• [ ] provide a view for "most similar" or "must different" ??
• [ ] remove gene set editor link and popup??

[nathandunn]

@jingchunzhu 's use-cases:

• the numbers of pathways to display
• most differential and most similar pathways
• I want to see a set of pathways with certain names or genes