keyword: backout realpath change (issue3071)

strip: backout 73307643a09f (issue3077)

largefiles: avoid checking requirements on every command When largefiles is enabled, commands on large repositories which don't require largefiles could be slowed down substantially. Disable checking this for every command.

largefiles: shorten test suite by using log --template

largefiles: fix bad bug where transplanting a changeset with a largefile will result in an old largefile being comitted later on

largefiles: test that a largefile cannot accidentally be re-added as a regular file