Removed (again) duplicates of methods for raise-sheet and bury-sheet on sheet-parent-mixin.
Removed (again) duplicates of methods for raise-sheet and bury-sheet on
sheet-parent-mixin.

Removed (again) duplicate of method for dispatch-repaint on
standard-repaint-mixin.

informatimago/mcclim,informatimago/mcclim,quek/mcclim,quek/mcclim