Fixed wc tests in Makefile
Added sid matching functions
Applied new decorators
Fixed a stupid typo
Be able to customize sid
Added an additional argument sid to save_account_to_session
Better name: actually it is sid matching required

- Renamed login_and_sid_required to login_and_sid_matching_required
- Renamed admin_and_sid_required to admin_and_sid_matching_required
- Renamed require_sid to require_sid_matching
Use the new sid parameter
Duplicated user name is allowed now
A small matter of English
Store user when login for testing and return json