Fixes in tmcroads, Add a display-option

- fix different undefined variables
- correct the counting of status of the points and links
- change the description/meaning of the status variable in status area (OK/Missing elements/No Relation)
- Add an switch in table foot and store the value in a cookie
  - deactivated: only roles of existing osm relations will be checked and displayed
  - activated: roles of all points and links will be checked and displayed, so it is possible to show you what elements you need to add to the relation
  - this switch has no impact of counting the status it is only "display-option"