0.2: Connecting scales scores with results through formulas

* Formulas parser undertands variables and comparision operators like "less", "more", "same", "not same", "and", "or"
* Formulas editor added with buttons of scales and comparision operators
* Show scale scores totals at the top of questions editor and on the formulas editor buttons
* Add shortcut buttons to the top of content editor: Add New Questions, Edit Questions, Edit Formulas
* Show test results calculated through formulas above above scales bars on the results page