[Xmonad] Heads up: state type change : darcs patch: make workspace tag not need to be a Num.

[Donald Bruce Stewart]

droundy:
> This is an amend-recorded version, which fixes a conflict with the recent
> haddock changes in StackSet.
> 
> David
> 
> Thu Jun 14 07:07:09 PDT 2007  David Roundy <droundy at darcs.net>
>   * make workspace tag not need to be a Num.
>   This change also removes the barely used 'size' field, and replaces
>   it with a tagMember predicate.  The idea is to move towards the ability
>   to make the workspace tag be a String, which by default might be "1".."9",
>   but could also be customized to be something meaningful to the user.
> 

Applied, thanks. Note there was a duplicate import list, so please check
-Wall next time.

Also, this patch is a state data type change, so restart/mod-q will not
remember hidden workspaces. Be sure to actually exit X after applying 
this patch. (State-format changing patches should be tagged as such).

-- Don