Added Darcs basic support.

Files in the repository can not be viewed or downloaded since Darcs doesn't support cat-like command.

git-svn-id: http://redmine.rubyforge.org/svn/trunk@573 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/repository.rb

@@ -30,6 +30,10 @@ class Repository < ActiveRecord::Base
     self.class.scm_name
   end
   
+  def supports_cat?
+    scm.supports_cat?
+  end
+  
   def entries(path=nil, identifier=nil)
     scm.entries(path, identifier)
   end