fsmonitor: change the distance calculation Change the distance calculation in the fsmonitor extension. It is done in a method since anticipated changes will need to use this logic as well. Test Plan: Tested on development server. Differential Revision: https://phab.mercurial-scm.org/D988

configitems: update default value of 'phases.new-commit' Now that mq is cleaned up, we can rely on the config register for the default value. We switch the default from the integer to human readable value to help with future automatic documentation that could be generated from the config register.