Added project module concept.

A project module (eg. issue tracking, news, wiki,...) is a set of permissions that can enabled/disabled at project level.
For each project, modules can be enabled on the project settings view ('Modules' tab).
This requires a specific permission: 'Select project modules' (if this permission is turned off, only Redmine administrators can choose which modules a project uses).

When applying this migration, all modules are enabled for all existing projects.

git-svn-id: http://redmine.rubyforge.org/svn/trunk@725 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/views/projects/_edit.rhtml

@@ -0,0 +1,4 @@
+<% labelled_tabular_form_for :project, @project, :url => { :action => "edit", :id => @project } do |f| %>
+<%= render :partial => 'form', :locals => { :f => f } %>
+<%= submit_tag l(:button_save) %>
+<% end %>