Added smart spacing to the spacing module
Added smart spacing to the spacing module

Ignore-this: 9104bc8feb832f63f2f18998c0f7ba92
Added smart spacing to the spacing module, which adds spacing to all windows,
except to windows on singleton workspaces.

darcs-hash:20120923034527-6243b-e3036a0e7e350648026148a4ff0d25db40358e52

jthornber/XMonadContrib,jthornber/XMonadContrib