Added add*type*() shorthands to DataForm.

Main feature is a introduce of all types shorthands. Now add() can be used in getter/setter style.

```
   $dataform->add('title','Title', 'text'); //name, label, type 
   $dataform->add('sef','Url', 'text')->rule('required');
```

now can be presents as:

```
   $dataform->addText('title','Title'); //name, label
   $dataform->addText('sef','Url')->rule('required');
```

Also fixed pagination unsetted crash.