merge: add merge action 'p' to record path conflicts during update
Add a new merge action to record path conflicts. A status message is
printed, and the path conflict is added to the merge state.
Differential Revision: https://phab.mercurial-scm.org/D776
requesting all changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 4 changes to 4 files
updating to branch default
4 files updated, 0 files merged, 0 files removed, 0 files unresolved
requesting all changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 4 changes to 4 files
updating to branch default
4 files updated, 0 files merged, 0 files removed, 0 files unresolved