update: support updating to hidden cset if directaccess config is set This patch adds support for updating to a hidden changeset without using --hidden if `experimental.directacces=True` is set. The update command will print out a warning when updating to a hidden changeset saying: `updating to a hidden changeset <hash>` The warning is also printed when directaccess is not used and --hidden is passed which I think is good behaviour. Tests are added for the directaccess part and updated output of tests which have case of updating to hidden cset using `--hidden`. Differential Revision: https://phab.mercurial-scm.org/D1762