Allow to have frames with the same name. For removing
real duplicated frames (generated by LO earlier)
check other things also next to the frame name:
position, size or whether the two frames are anchored
to the same position.

Change-Id: I191ae5128d0228eb85f78f065b44b1f0b3ba6dcf
Reviewed-on: https://gerrit.libreoffice.org/37702Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tamás Zolnai <tamas.zolnai@collabora.com>