Default sources

[alancleary]

Currently in the search and multi views, if no sources are provided as url query parameters then no data is loaded from any source, other than the query source in the case of the search view. This should be changed so that some source(s) are used by default when none are provided. Should this be the same as #155 where the first source in the list is used as default in the search or should all sources be used when none are provided?

[adf-ncgr]

I think it's probably best to do it the way you had suggested (ie if no sources are selected, go ahead and search them all). One could imagine eventually making the query work the same way (ie if none specified, then ask them all), which might be appropriate and also use some of the same UI machinery needed if we decide to start allowing fuzzier querying ala #94.

[alancleary]

@adf-ncgr Sounds good. Moving to stage.

[alancleary]

Fixed in commit bb6d034.