Fix backportUnittest for Python 2.7.4
fixup! Fix backportUnittest for Python 2.7.4
Position can relate to Person.
Provide standard "Location" header when contributing a file.
fixup! Provide standard "Location" header when contributing a file.

"Location" is also used for redirection, so it cannot be used. Use a
similar but non-standard harder instead.
Folder: do not silently ignore non existant id generator