Like cookboob does.

Since headers are for AGPLv3+, it's probably ok to set it here

Do not accept anymore pastes from other instances than the configured
instance.

But it's really not enough. A deep rework of documentation on this
module is mandatory. First, explain each objects:

 * Subscription at top level
 * Each subscription can have a list of Document/Detail/Bill
 * Explain differences between get_details and iter_history
 * Explain what is a balance (it's a "Detail" object! We are crazy
   sometimes)
 * Clean all references of phones/lines. Since the capability was made
   for something like "CapBillTelefon" at begin, it's not clean
   everywhere

(and also update the maintainer's email address)

Commit 631364b0 (library: rename get_booked/get_rented) updated API,
without module updates. Even if this module is probably broken, it's a
bad idea to keep invalid code.

weboob.browser.filters.base will contain the internal classes like
Filter and core like FilterError.

TableCell is imported in filters.html to let modules migrate, then it
can be fully moved.

Using str on Comments object will generate an encoded-str in python2,
which will fail when concatenated to a unicode.