Update various vim plugins; gdbinit security changes

Possibly insecure: allow loading .gdbinit files in the current directory
from any directory in my home dir.

Update all submoduled plugins. Add vim-orgmode.
Use CtrlP to replace Molly
Lots of changes, esp. wrt. i3

Added i3 configuration to repository, which starts Dropbox and a script
I've written which allows us to have different wallpapers for different
i3 workspaces.

Further to this, I've added a selection of wallpapers to the wallpapers
directory, all from Simple Desktops (http://simpledesktops.com). These
are in the repository, but are in no way my creation.

Added the vim-speeddating plugin, as vim-orgmode seemed to want it. Also
added the spelling dictionary add-file to the repository, though it's
not really got anything in it. Updated SurvivalGuide to reflect
disappearance of Molly.

Modified the install script to finally work as intended and only update
symlinks which don't already exist.
Missed some adds in last commit.
Add Vim Rust support bundle repo; remove vim-snipmate.
Add Go filetype support to Vim.
Remove Limp; move some stuff around.
Various cosmetic and not-so changes; mainly: switch to Powerline.

Now using Inconsolata instead of Monaco in urxvt purely because I can't
get Powerline to work properly. Fix the random crap the bashrc used to
print. Add Powerline, some scripts to fetch the fonts and add them to
vim.
Change colour scheme; update wallpaper tool; Powerline config