sw doc model xml dump: handle SwFmtFrmSize

Change-Id: Ie1a8dbc86c9725f3d238226c166ec657722c1770
SwTextBoxHelper::syncProperty: handle TextAutoGrowHeight

This propagates the "to shape to text" property of the shape to the
textbox, and the textbox is already layouted accordingly, but not the
shape yet. (As the shape thinks it has no text.)

Change-Id: I1fdf0d5743bcb201f112a4c5db18924210858cea