phabricator: add debug logging to show previous node values in `phabsend`
This isn't real useful here, but was very useful showing how `phabsend --fold`
handles commits created by `hg fold` and `hg split`. It introduces a new debug
function and flag instead of using `ui.debug()`, because `--debug` prints out
all of the API chatter.
Differential Revision: https://phab.mercurial-scm.org/D8389
adding changesets
adding manifests
adding file changes
added 1 changesets with 4 changes to 4 files
new changesets d326ae2d01ee (1 drafts)
4 files updated, 0 files merged, 0 files removed, 0 files unresolved
adding changesets
adding manifests
adding file changes
added 1 changesets with 4 changes to 4 files
new changesets d326ae2d01ee (1 drafts)
4 files updated, 0 files merged, 0 files removed, 0 files unresolved