Remove analytics namespace import into catmaid.control

This is part of an effort to make the URL configuration and the control
package more readable and maintainable. I double checked, that all
catmaid.control namespace imports removed, where not in use in other
places.

This commit relates to issue #570.
Remove graph namespace import into catmaid.control

This is part of an effort to make the URL configuration and the control
package more readable and maintainable. I double checked, that all
catmaid.control namespace imports removed, where not in use in other
places.

This commit relates to issue #570
Remove wiringdiagram namespace import into catmaid.control

This is part of an effort to make the URL configuration and the control
package more readable and maintainable. I double checked, that all
catmaid.control namespace imports removed, where not in use in other
places.

This commit relates to issue #570.