Fix parent wiki menu entry preselection


- the parent menu entry if it has already been selected
- the menu entry pointing to the parent wiki page if there is both - the parent page and its menu entry
Change variable naming in wiki menu items controller
Update changelog
Fix parent menu item preselection of grand children of a wiki page
Delete loc of wiki_page#nearest_menu_item
Merge branch 'feature/rails3_default_parent_wiki_menu_item' of github.com:opf/openproject into feature/rails3_default_parent_wiki_menu_item

Conflicts:
	doc/CHANGELOG.md
Add integration tests for parent wiki menu item preselection