import part for: "export to extension namespace instead of odf ..."

See master commit a4e4cdcdd7acfe779b2a3b244dd449f136308a93

(cherry picked from commit 40ac1ada98e3e2648daf9d17e520040be2c17911)
Signed-off-by: Michael Stahl <mstahl@redhat.com>

Conflicts:
	xmloff/source/style/PageMasterStyleMap.cxx

Change-Id: I0b61e05e3b153ba7efe351b18cb705ea6348f546