libcanvas/Canvas.py:_dispatchDeltaPatches(): handle `resize' delta patches.
libcanvas/Canvas.py:_dispatchPatch(): only commit to journal given commitUndo.
libcanvas/Canvas.py:resize(): commit `resize' & {deleted,added} cell deltas to journal.
libcanvas/Canvas.py: minor cleanup.
libcanvas/Canvas{Backend,{Export,Import}Store,Journal}.py: minor cleanup.
assets/text/arab-puke.txt: added from mircart/pack2/.
assets/text/TODO: updated.