Add write control on repository from Redmine interface

* new methods to add/remove rights in app/models/role.rb
  * some unit tests
  * add write check in Redmine.pm

To keep compatibility migration add write rights to non builtin roles
but default clean install give write access only to manager and
developer, not to reporter.


git-svn-id: http://redmine.rubyforge.org/svn/branches/nbc@1791 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/unit/role_test.rb

@@ -30,4 +30,24 @@ class RoleTest < Test::Unit::TestCase
     target.reload
     assert_equal 90, target.workflows.size
   end
+
+  def test_add_permission
+    role = Role.find(1)
+    size = role.permissions.size
+    role.add_permission!("apermission", "anotherpermission")
+    role.reload
+    assert role.permissions.include?(:anotherpermission)
+    assert_equal size + 2, role.permissions.size
+  end
+
+  def test_remove_permission
+    role = Role.find(1)
+    size = role.permissions.size
+    perm = role.permissions[0..1]
+    role.remove_permission!(*perm)
+    role.reload
+    assert ! role.permissions.include?(perm[0])
+    assert_equal size - 2, role.permissions.size
+  end
+
 end