Do the following:

• Implement a hips sources frame work similar to the image sources frame work in server/visualize. 
• It should be a search processor the merges data from more than one source
• Move the query of CDS for the firefly server - this is one hips source
• The framework should add a column to CDS for a popular flag 
• Create a list of IRSA surveys from format similar to edu/caltech/ipac/firefly/resources/irsa-image-master-table.csv - this is the second hips source, the popular flag should be set on all of these.
• Framework should merge the hips sources
• On the client side there should be a filter that can modify the popular flag or add sources.
• The UI should be changes to choose the popular HiPS based on the Popular flag of the table.