Runcat page: RA and Dec queries

[AntoniaR]

Currently we have to input max and min values of RA and Dec to query. This is quite counter-intuitive for astronomers as we usually know the RA and Dec of a location of interest and then want to query a given radius. It is very rare that we want sources within a rectangle. Querying by source radius used to be the case for searching for possible associations but has been removed at some point...

1. Querying by search radius should be reimplemented for the possible associations button from an individual runcat source
2. Include a single RA and Dec with a search radius query on the overall runcat page

[AntoniaR]

This dataset/database is good for testing queries - high number of sources in each image (835 runcat sources) but a very small database so the runcat queries are fast: http://banana.transientskp.org/master/vlo_antonia_R20/dataset/2/