Added reverse sorting for all listings.

Fixes https://github.com/OpenUserJs/OpenUserJS.org/issues/292

Added reverse sorting to listings:
* scripts
* script issues
* libraries
* library issues
* groups
* group scripts
* (sub)discussions
* users
* user scripts
* user issues
* flagged scripts
* flagged libraries
* flagged users
* graveyard

Also fixed ordering `Removed By` in `Removed Items` list;