* 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
Uses ajax to handle (possibly) long queries on historical data
with the aim of improving user experience.
The user is notified when a query is taking too long so that
he/she can get feedback of what is going on.
Interface flows are now stored using integer interface ids rather
than interface names. This speeds up queries.
A migration code has also been introduced so that old MySQL table
format is migrated and old data does not get lost.
This also fixes#460
