Functions SUMIFS, AVERAGEIFS, COUNTIFS, MINIFS, MAXIFS were not
supported External references.

The root cause issue, was using PopMatrix() method for:
svExternalSingleRef and svExternalDoubleRef.

PopMatrix() method only supports svMatrix, and in other
cases returns FormulaError::IllegalParameter error.

To resolve that issue, the method GetMatrix() was used.
It is properly support svMatrix, svExternalSingleRef and svExternalDoubleRef.

Change-Id: I3e30ca50069264a6d990b16ec668e6d0df51c6e6
Reviewed-on: https://gerrit.libreoffice.org/49264Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Eike Rathke <erack@redhat.com>