Use fallbacks in the wrappers for Subversion support, instead of prefixes. The change only applies to the ambiguous URL schemes: file, http and https. The others - svn+ssh and svn - behave the same as previously. For http and https, the wrapping is implemented in 'svnrepo.py': Only when the attempt to create a httprepo instance fails, will the URL be considered for Subversion URL. For file, the ambiguity is treated much like the Mercurial core distinguishes bundle and directories. In this case, a directory that looks like a Subversion repository will *not* be considered for a Mercurial clone. Tthe command lines are more similar to before this refactor. The only option added to push & pull is --stupid; others are only added to clone. Any of these options specified to clone will be added to the generated '.hgrc'. Also, the -r/--rev option now works for clone & push.

--- a/tests/test_util.py
+++ b/tests/test_util.py
@@ -31,7 +31,7 @@ def fileurl(path):
     path = urllib.pathname2url(path)
     if drive:
         drive = '/' + drive
-    url = 'svn+file://%s%s' % (drive, path)
+    url = 'file://%s%s' % (drive, path)
     return url
 
 def load_svndump_fixture(path, fixture_name):