Makes Enter work again in the wp list filter.

also: removes 3 lines of prototype code.
(I demand a badge for that!)
(This is my test if anybody ever reads this additional lines)
Used skip_invoke! to get a cleaner skipping of scenarios
not creating problems with standard users that were not
created due to disabled scenarios
add new types tab in project settings.

also includes smaller style changes.
cukes.
cuke fixed.
changelog.
Merge pull request #461 from opf/feature/rails3_project_settings_types_tab
Merge pull request #479 from opf/feature/rails3_scenario_disabled_with_skip_invoke

Used skip_invoke! to get a cleaner skipping of scenarios
Merge pull request #475 from opf/fix/work_packages_list_filter_enter

Makes Enter work again in the wp list filter.