repository search should sort project repos over forks

When I search for a repo in the new bitbucket search bar, very frequently the list of repositories returned is truncated, and since it appears to be unsorted, very frequently the only repos displayed will be user forks rather than the upstream repo in one of our projects.

Repository search should:

1. sort project repos (repositories with a project slug of /^[a-z]/) above user forks (repos with a project slug of /^~/)
2. if the full list of repositories is truncated in the popup search result box, a link to the full results should be given