move styles from view.js to style.css
- added labels for checkboxes
- replaced some repeated code with a for-loop (this could be even nicer but a little rework of code had to be done)
optimized speed of getFiles : only files with matching maintag are returned from server, room trash will not be traversed at all
Merge branch 'develop' of https://github.com/winfel/wa_knowledge_structuring into develop