Column-ordering crashes for structurally deficient matrices

Submitted by Christoph Hertzberg @chhtz

Assigned to Nobody

Link to original bugzilla bug (#1045)
Version: 3.3 (current stable)

Description

This was revealed while extending the unit tests for Bug #792 (closed).
To reproduce, activate rank deficiency checking in the sparselu testcase.

Blocking

#558 (closed)