Edit styles to make old comment form better readable.
 This commit includes a new template which should eventualy act
 as a replacement for crispyforms which do not allow for
 easy bootstrap implementation.

The Comment model now has a option to
 append a file (pdf, png, jpg) to itself.

CAUTION! READ ME!
This migration will setup a proper attachment environment.
This means, that for existing files (journal publication!),
 these folders/files should be completely moved to the MEDIA_ROOT
 folder, else this will return a 404 NotFound for the related
 files.

Improve comments app to follow PEP rules
 and remove all wildcard imports!!

I keep get weird bugs. Maybe merging in development will help.

- Alter field in_agreement on comment
- Alter field in_disagreement on comment
- Alter field in_notsure on comment
- Alter field is_cor on comment