When two floating tables were belong to the same paragraph,
import makes one of them anchored to the other instead of
anchorig both to the corresponding paragraph.

Modifications:
- Check the whole text range for anchored frames not
just one point of it.
- Save frame format's name because SwFrmFmt pointers can
become invalid.

Change-Id: Ide7c894065b619095a8e713ff0622bbea4f199b6