Rename variables and reformats user/admin logic
Add an is_trusted field to upload and edit forms
Restructure fields on upload and edit pages
Add simple styling for checkboxes
Add titles (mouseover) for checkboxes with crude explanations
Show Anonymous checkbox during upload and check & disable it for guests
Show Trusted checkbox for users at or above Trusted level
Adjust description field rendering to show field label above it
Add title (mouseover) for edit icon on torrent page
Show uploader for admins on anonymous torrents
Show uploader for admins when editing others' torrents
This will allow most (if not all) torrents that have been rejected by 'Malformed torrent metadata (path part is empty)'
Adjusts _validate_bytes to disable empty check
Adds the empty check to file tree parsing
Fixes issue #42
Also adds logic for private torrents requiring site tracker as the main tracker (otherwise there's no point on uploading them on the site)
Changes upload.html wording to reflect the requirement to have the tracker, not necessarily as the first one.
