Moved view files to the folder views/ and removed the _view prefix from their filename.

This declutters the filespace, and makes it easier to find views
Created config.dist.php

This is a "safe" version of the config file, not including sensitive information, like account numbers
Added .idea to gitignore, and removed config.php
Added ability to mark a registration af final.

A final registration cannot be changed by the group, but can be reopened by an administrator.