Document new features in Wiki

[ypnos-web]

Some features of 2.0/3.x have not yet been documented:

• Use of ColumnDefinitions for very convenient setup and later enrichment of column definitions
• Being able to pass order parametrization in Cake ORM style to datatables (so it can be passed from the controller as a view variable)
• All the fancy things we do with JavaScript callbacks
• Support of field types and individual comparison operators
• Passing localSearch/globalSearch options to the ORM for individual filter implementations