(appt-check): Use the new variables
appt-disp-window-function and appt-delete-window-function. (appt-disp-window-function): New variable. (appt-delete-window-function): New variable. (appt-delete-window): New function. (appt-disp-window): Don't delete the appt window here; instead, call appt-delete-window-function. Fixed bug that messed up the screen when appt-check ran when mouse is in the minibuffer. Call select-frame only if window-system.
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