hogan lab feedback 5/1/20

[vincerubinetti]

• add sample description to "inspect barcode view" table
• fix glitch where grouping some samples, switching to another experiment, and grouping more samples doesn't display volcano data
• add sample description to heatmap tooltip
• ungroup samples when switching experiments
• make more obvious that barcode can be clicked
• show amount of results below each search table to indicate it's not everything available in the database
• add tooltip on disabled col header buttons
• clarify volcano error message
• update dartmouth logo and text
• change MAX_INT to maxLimit, move from controllers to backend functions

closes #172

[vincerubinetti]

@dongbohu I might merge this without review since it fixes a bad bug the Hogan lab discovered today, and people might test it further over the weekend. You can review it later.