record: update comment to match code
Commit
205599e31870 changed how newfiles get passed to commitfunc, but
did not change the corresponding comment that explains this. This
commit also updates this comment.
hg: update newly added listdir function of vfs in clone
This change invokes os.listdir() via newly added vfs function in clone.
hg: use vfs functions in clone
This change applies vfs functions in clone. destvfs.exists will invoke
os.path.lexists via lexists of vfs to check for broken symbolic links.