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/views/repositories/changes.rhtml

@@ -2,6 +2,7 @@
 
 <h3><%=h @entry.name %></h3>
 
+<% if @repository.supports_cat? %>
 <p>
 <% if @entry.is_text? %>
 <%= link_to l(:button_view), {:action => 'entry', :id => @project, :path => @path, :rev => @rev } %> |
@@ -9,5 +10,6 @@
 <%= link_to l(:button_download), {:action => 'entry', :id => @project, :path => @path, :rev => @rev, :format => 'raw' } %>
 <%= "(#{number_to_human_size(@entry.size)})" if @entry.size %>
 </p>
+<% end %>
 
 <%= render :partial => 'revisions', :locals => {:project => @project, :path => @path, :revisions => @changes, :entry => @entry }%>