Adds an option to generate sequential project identifiers.

Disabled by default, it can be enabled on the 'Projects' tab in application settings.

git-svn-id: http://redmine.rubyforge.org/svn/trunk@1777 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/unit/project_test.rb

@@ -130,4 +130,15 @@ class ProjectTest < Test::Unit::TestCase
     assert_equal [1, 2, 3], parent.rolled_up_trackers.collect(&:id)
     assert_equal [2, 3], child.rolled_up_trackers.collect(&:id)
   end
+  
+  def test_next_identifier
+    ProjectCustomField.delete_all
+    Project.create!(:name => 'last', :identifier => 'p2008040')
+    assert_equal 'p2008041', Project.next_identifier
+  end
+  
+  def test_next_identifier_first_project
+    Project.delete_all
+    assert_nil Project.next_identifier
+  end
 end