The special characters were URL encoded during HTTP request and saved in URL encoded form.
The login used the unencoded password instead, and this resulted in a password hash mismatch which prevented user login.
Now the password hash is calculated on the unencoded password.
* partial work
* Migrate 'mode' parameters
* Migrate alerts types
* Fix some interface ids
* Partial work
* Partial work
* End of work for _GET parameters
* Work in progress
* Add support for special parameters
* Preferences validation
* Fixes and improvements
* Enforce interger validation
