darcs repository web UI and hosting app. This is the main darcsden trunk, which also runs hub.darcs.net. (https://hub.darcs.net)

#190make darcsden build with GHC 8.10

I think GHC 8.10 is the minimum GHC that can work on my machines (older versions aren't good enough on either my mac or my VPS for various reasons). I need to get darcsden and all its deps building with GHC 8.10 so I can work on it again. Any help toward this goal is welcome.