WIP: Refactor study description

This WIP pull request is breaking up the study description handler in multiple UI modules, as well as breaking up the study handlers file to be hosted on multiple files for easy edition.

I still need to decompose the post of the study handler in multiple post-only handlers that will help to maintain the page.

Feel free to make any comment if you feel that there is something really wrong.
I think another option will be to modify the object so you can pass either an integer or a string for instantiation. I think it will minimize the number of changes. Do you agree? Also it would be good to hear from somebody else, because this will mean a change in a base object