* Add a setting to allow accessing individual gists without auth
This is a middle ground between the existing setting "Require Login",
which requires login to do anything at all, and having it off, which
shows a public list of gists and more generally allows discovering info
about the users/gists of the instance without login.
The idea of this setting is that it is "require login" for everything
except individual gists.
Fixes#228.
Co-authored-by: Thomas Miceli <tho.miceli@gmail.com>
* Fix gist content when going back to editing
* Fix not outputting non-truncated large files for editon/zip download
* Allow dashes in usernames
* Delete keys associated to deleted user
* Fix error message when there is no files in gist
* Show if there is not files in gist preview
* Fix log parsing for the 11th empty commit
