back interdiff of round #3 and #2

appview: Update New PR Page #490

The compare forks option dropdown now shows repos in which you are a collaborator on instead of just repos you own.

files
appview
db
pages
templates
repo
pulls
pulls
ERROR
appview/db/repos.go

Failed to calculate interdiff for this file.

ERROR
appview/pages/templates/repo/pulls/fragments/pullCompareForks.html

Failed to calculate interdiff for this file.

ERROR
appview/pulls/pulls.go

Failed to calculate interdiff for this file.