package updater: if package location reported by nix-env is not correct, fallback to grep to
locate it.
package generator: upgrade hashes from md5 and sha1 to sha256
package updater: sometimes nix-prefetch-url returns 0 when the download fails.
updater tool: allow requesting several actions at once, add --all option to request a typical
update checker run.
web interface: add vulnerability mark to packages in the /outdated list
web interface: add package details page
package updater: force checkout of nixpkgs to clean up after a failed/aborted patching run
package updater: if repository checkouts are requested among other actions, use their output
instead of older cached data
DistroPackage::Nix: obtain drv path and output path
package updater: implement trivial patch builder
web interface: expose build logs, clean up version rendering
web interface: load package details using AJAX
web interface: report correct content-type for css and js