SdrPage::dumpAsXml: typo

Change-Id: I9aef4e1bdec68456293a88c410ecf45eb85c7489
Move SdrPage::dumpAsXml() up to SdrObjList

So that group shapes having an SdrObjList can reuse that.

Change-Id: Icc8a8dd8d1f90b368142a1c7b42249bc34b3bebb
Add SdrObjGroup::dumpAsXml() to show contents of group shapes

Change-Id: I8b713cbd64f91ad62d06ef57d790ac4e54e37315
Factor out SwFmtFrmSize::dumpAsXml() from nodedump

Change-Id: Idcf24d40876230a0e34f2f816dfe414b4a143f53