I tested to use undo events for unfloat operations:
moving a table outside of the text frame and removing the
text frame, but sometimes it just crashed. So now we handle
unfloating similar to the reverse operation (table is moved
into a text frame(MakeFlyAndMove).

Change-Id: I4eaeda550ccc51252abd4abde6cee45c76a8483e
Reviewed-on: https://gerrit.libreoffice.org/65822Reviewed-by: Tamás Zolnai <tamas.zolnai@collabora.com>
Tested-by: Tamás Zolnai <tamas.zolnai@collabora.com>
Tested-by: Jenkins