Use the freshly bound buffer.
Thread refreshing.
Refresh for catalog
Have each post remember where it was rendered.
Keep track of the posts structure in each buffer.
Jumping to the next post
Make faces work on strings instead of the whole buffer.

This makes it easier to test but more importantly, it now ensures
that post render positions are going to be set properly as we no longer modify
the buffer after setting renderpos.
Merge branch 'inplace-face' into post-nav
Remove unused function.
Jump to thread-local links instead of simply reloading the whole thread.
Jumping in arbitrary direction and number of posts. Two interactive functions.
Keymap.
Start yon-chan-mode for the catalog too.
Allow post jumping for the catalog.
Make the post scroll up to the very top after a post jump.
Update the old tests.
Merge branch 'util' into post-nav

Conflicts:
	yon-chan.el
Refresh keybind
Binds and funcs for jumping to first/last post.
Fix a bug where the link would be broken if it was a general board link (>>>/a/)