dispatch: improve repository not found message

This should help clarify what the problem is in various problematic
cases like ssh.

mercurial/dispatch.py

@@ -586,8 +586,8 b' def _dispatch(ui, args):'
                     if guess and repos.count(guess) == len(repos):
                         return _dispatch(ui, ['--repository', guess] + fullargs)
                 if not path:
-                    raise error.RepoError(_("There is no Mercurial repository"
-                                      " here (.hg not found)"))
+                    raise error.RepoError(_("no repository found in %r"
+                                            " (.hg not found)") % os.getcwd())
                 raise
         args.insert(0, repo)
     elif rpath:

tests/test-dispatch.t

@@ -47,6 +47,6 b' No repo:'
 
   $ cd $dir
   $ hg cat
-  abort: There is no Mercurial repository here (.hg not found)!
+  abort: no repository found in '$TESTTMP' (.hg not found)!
   [255]
 

tests/test-globalopts.t

@@ -84,13 +84,13 b' Implicit -R:'
   $ hg ann a/a a/a
   0: a
   $ hg ann a/a b/b
-  abort: There is no Mercurial repository here (.hg not found)!
+  abort: no repository found in '$TESTTMP' (.hg not found)!
   [255]
   $ hg -R b ann a/a
   abort: a/a not under root
   [255]
   $ hg log
-  abort: There is no Mercurial repository here (.hg not found)!
+  abort: no repository found in '$TESTTMP' (.hg not found)!
   [255]
 
 Abbreviation of long option:

tests/test-i18n.t

@@ -8,17 +8,17 b' Default encoding in tests is "ascii" and'
 using the "replace" error handler:
 
   $ LANGUAGE=pt_BR hg tip
-  abortado: N?o h? um reposit?rio do Mercurial aqui (.hg n?o encontrado)!
+  abortado: no repository found in '$TESTTMP' (.hg not found)!
   [255]
 
 Using a more accomodating encoding:
 
   $ HGENCODING=UTF-8 LANGUAGE=pt_BR hg tip
-  abortado: N\xc3\xa3o h\xc3\xa1 um reposit\xc3\xb3rio do Mercurial aqui (.hg n\xc3\xa3o encontrado)! (esc)
+  abortado: no repository found in '$TESTTMP' (.hg not found)!
   [255]
 
 Different encoding:
 
   $ HGENCODING=Latin-1 LANGUAGE=pt_BR hg tip
-  abortado: N\xe3o h\xe1 um reposit\xf3rio do Mercurial aqui (.hg n\xe3o encontrado)! (esc)
+  abortado: no repository found in '$TESTTMP' (.hg not found)!
   [255]