Merge branch 'jg/status-config'

"git status" learned status.branch and status.short configuration variables to use --branch and --short options by default (override with --no-branch and --no-short options from the command line). * jg/status-config: status/commit: make sure --porcelain is not affected by user-facing config commit: make it work with status.short status: introduce status.branch to enable --branch by default status: introduce status.short to enable --short by default