New certificat
Fix crash when no data available
Display validity date
Add multi-account support for bills
fix login on societegenerale
do not crash when an account is unavailable
Small coding style issue
Get real ID directly with url2id
do not crash on stockfunds pages
s/entry.link/url/g
fix deferred debit cards parsing
detect when website is unavailable
More robust currency guessing

This allows to parse PayPal balances which includes both symbol and letters, for
instance "$ 42,00 USD".
Also, it does not require adding any new symbols to the regular
expression.
It might break modules, though numerous cases were tested.
Add basic PayPal module

Limitations for now:
* Only French-style (UUU,CC and not UUU.CC) balances; the choice is not left up to the user so
  it's hard to test
* No history (should be easy to add)
paypal: Start support for multiple currencies

For now, ignore everything that is not the primary, and do not use the
converted total.

This is based on http://i.imgur.com/TNcLbPB.jpg
as I have 0 in all currencies for now.
paypal: Proper multi-currency support

An account per currency.
And fix xpath (missing ".").
paypal: Fix balance parsing with a single currency account
paypal: Support "american" balance style

Sources: http://i.imgur.com/rtcuMDa.jpg http://i.imgur.com/TNcLbPB.jpg
paypal: Add function to download the CSV history
Add a CSV parser