[xmonad] (DynamicWorkspaces) Generalize new workspace addition functions to support arbitrary insertion

[Arjun Comar]

This patch was developed based on a request for functionality at:
http://www.reddit.com/r/xmonad/comments/2pnjse/dynamic_workspaces_appending_new_workspace_from/

* Generalize new workspace addition functions to support arbitrary
insertion.

  The current DynamicWorkspaces module only supports adding new workspaces
  at the start of the list of workspaces. This means when binding workspaces
  to keys based on the position in the list, key bindings can change
  as workspaces are added in removed in a far more destructive way than
  necessary. Instead, supporting appending and arbitrary insertion allows
  the user to determine where the new workspace should be added.

  This patch is a straight generalization of the addHiddenWorkspace'
function.
  Rather than always using `(:)` to insert the new workspace into the list
  of workspaces, this patches causes it to use an arbitrary list insertion
  function instead. A few new functions are added to prevent breakage of
  external code while exported functions are left unchanged.

  List of new functions:
    appendWorkspace
    appendWorkspacePrompt
    addWorkspaceAt
    addHiddenWorkspaceAt

  Existing functions were modified to call their generalized brethren where
possible
  without changing functionality. This patch should not change behavior for
any
  existing users of this module.
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