cmdutil: introduce 'editform' to distinguish the purpose of commit text editing
This information will be used to switch '[committemplate] changeset'
definition according to its purpose in the subsequent patch.
This information also makes it easier to hook commit text editing only
in the specific cases.
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