New account switching functions.

New account switching functions.

This brings 3 new user functions for ease of switching accounts...

  `emoney-goto-default-account' -- switches directly to the default
    account.  See: `emoney-default-account'.
    Binding: `C-c d'

  `emoney-walk-accounts-next' -- switch to the 'next' account.
    Binding: `M-n'

  `emoney-walk-accounts-previous' -- switch to the 'previous' account.
    Binding: `M-p'

	* emoney.el (emoney-goto-default-account): New convenience
	function for quickly switching to the default account.
	(emoney-walk-accounts): New. Walk through account list.
	(emoney-walk-accounts-next): New. Switch to 'next' account in
	list.
	(emoney-walk-accounts-previous): New. Switch to 'previous' account
	in list.
	(emoney-mode-map): Add bindings for walk/goto-default functions.

Signed-off-by: Steve Youngs <steve@sxemacs.org>