Directory class

* Added more user friendly find function
Class name conversions

* Added class name conversion from model format
Attr model

* Make public get_attr function for attr model
* Database get_attr respects id policy
* Added to_html function to Template class
* Added silent tag alias
Page

* Extended browse_tree to return whole subtree
Template class

* Fixed aliases
Attr names

* Added attr name convention
* Added attr names for basic models
Locales
Model names

* Added get_model_name to attr model
Flow class

* Fixed redirect_now missing attrs in Flow class
Forms

* Fixed textarea, dropped value attr before rendering
Forms, input length

* Fixed form input max length for textarea
Database model

* Added unified name getter to database model