FollowLink per Peter Hercek

This is a simplified subset of Topovica which is a subset of Vimperator. The idea is to use default Firefox shortcuts whenever they are available and use the Vimperator style when nothing appropriate is provided by Firefox. It is a pity that an easy link following is not in Firefox by default.

• `SysRq` → brings up the buffer selector interface. Typing will search buffers for matching indexes or titles, displaying them as hints. `Tab` or `Shift+Tab` cycles between hints. Pressing `Enter` jumps to the first match if no hint is selected, else to the selected hint
• `Break`, `Pause` → displays indexes for links: typing in those indexes follows the link in the current tab or a new tab, respectively.
• `PrintScreen` → copies the current url to the clipboard