Added basic support for CVS and Mercurial SCMs.

Browsing, changesets fetching and diff viewing are implemented.
Only tested with local repositories.

Thanks to Ralph Vater for CVS specific code.

git-svn-id: http://redmine.rubyforge.org/svn/trunk@559 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/views/repositories/_navigation.rhtml

@@ -5,7 +5,8 @@ if 'file' == kind
     filename = dirs.pop
 end
 link_path = ''
-dirs.each do |dir| 
+dirs.each do |dir|
+    next if dir.blank?
     link_path << '/' unless link_path.empty?
     link_path << "#{dir}" 
     %>
@@ -15,4 +16,4 @@ dirs.each do |dir|
     / <%= link_to h(filename), :action => 'revisions', :id => @project, :path => "#{link_path}/#{filename}", :rev => @rev %>
 <% end %>
 
-<%= "@ #{revision}" if revision %>
+<%= "@ #{revision}" if revision %>