Reflection system

* Digital diary
 * View: Create a diary entry
 * View: View an existing entry
    * Contains entry, TextQuestions for this day, graph of RangeQuetions with current day marked
 * View: Overview for reflection system
    * Contains today's diary entry or a form for entering a new entry
    * Diagrams 
    * Form for activating/deactivating existing catalogues

* Questionnaire
    * Model: Catalogue (name, description, author_id, activated)
        * Can load questions from CSV file
    * Model: Question (text, )
        * RangeQuestion (start_value, end_value)
        * TextQuestion (is_short) 
    * Model: Answer (datetime)
        * RangeAnswer (value)
        * TextAnswer (value)
    * View macro: CRUD for Answer objects