zsh completion: tweak options for `incoming`, `outgoing` and `rebase`

 * `incoming --rev` completes _hg_labels, not jsut tags;
 * `outgoing --rev` completes revrange;
 * source/dest/base for `rebase` require argument.

contrib/zsh_completion

@@ -689,7 +689,7 b' typeset -A _hg_cmd_globals'
   _arguments -s -w : $_hg_log_opts $_hg_branch_bmark_opts $_hg_remote_opts \
                      $_hg_subrepos_opts \
   '(--force -f)'{-f,--force}'[run even when the remote repository is unrelated]' \
-  '(--rev -r)'{-r+,--rev}'[a specific revision up to which you would like to pull]:revision:_hg_tags' \
+  '(--rev -r)'{-r+,--rev}'[a specific revision up to which you would like to pull]:revision:_hg_labels' \
   '(--newest-first -n)'{-n,--newest-first}'[show newest record first]' \
   '--bundle[file to store the bundles into]:bundle file:_files' \
   ':source:_hg_remote'
@@ -743,7 +743,7 b' typeset -A _hg_cmd_globals'
   _arguments -s -w : $_hg_log_opts $_hg_branch_bmark_opts $_hg_remote_opts \
                      $_hg_subrepos_opts \
   '(--force -f)'{-f,--force}'[run even when the remote repository is unrelated]' \
-  '(--rev -r)'{-r+,--rev}'[a specific revision you would like to push]' \
+  '*'{-r,--rev}'[a specific revision you would like to push]:revision:_hg_revrange' \
   '(--newest-first -n)'{-n,--newest-first}'[show newest record first]' \
   ':destination:_hg_remote'
 }
@@ -1169,9 +1169,9 b' typeset -A _hg_cmd_globals'
 _hg_cmd_rebase() {
   _arguments -s -w : $_hg_global_opts $_hg_commit_opts $_hg_mergetool_opts \
   '*'{-r,--rev}'[rebase these revisions]:revision:_hg_revrange' \
-  '(--source -s)'{-s,--source}'[rebase from the specified changeset]:revision:_hg_labels' \
-  '(--base -b)'{-b,--base}'[rebase from the base of the specified changeset]:revision:_hg_labels' \
-  '(--dest -d)'{-d,--dest}'[rebase onto the specified changeset]' \
+  '(--source -s)'{-s+,--source}'[rebase from the specified changeset]:revision:_hg_labels' \
+  '(--base -b)'{-b+,--base}'[rebase from the base of the specified changeset]:revision:_hg_labels' \
+  '(--dest -d)'{-d+,--dest}'[rebase onto the specified changeset]:revision:_hg_labels' \
   '--collapse[collapse the rebased changeset]' \
   '--keep[keep original changeset]' \
   '--keepbranches[keep original branch name]' \