- added example code for application components
- added missing short description

[ci skip]

Related to b3b5e36d.

When we do not want an attribute to be searched we do not define it in
the filter model, or mark it inctive in the scenario when we use the
original model.
GridView should not try to access the attribute then and automatically
not display the filter field.

crud generator WIP.

attribute:type:Header should also affect sort link

default format is text in short format so it should also be
like that in array() defintion.