Suggesting a previous/next topic button

[JammyDodger]

Le scorciatoie da tastiera per questa funzionalità sono state aggiunte in:

FEATURE: g,j and g,k to navigate to next and prev topic

Previous/next topic

This is complete for top level nav, tags and categories per: Will see if I can add it to PMs, search and bookmarks, but the basics are all here.