leaks in multiple calls for preallocating AIJ matrices

[Lisandro Dalcin]

Currently, making sucessive calls for preallocating AIJ matrices seem
to originate memory leaks.

How should this be corrected? I would prefer that this is a valid
operation, and fix appropriate routines to deallocate/reuse previous
memory, and set the new user-specified preallocation data.

Other point: should this fix go to release-2.3.3?


-- 
Lisandro Dalcín
---------------
Centro Internacional de Métodos Computacionales en Ingeniería (CIMEC)
Instituto de Desarrollo Tecnológico para la Industria Química (INTEC)
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
PTLC - Güemes 3450, (3000) Santa Fe, Argentina
Tel/Fax: +54-(0)342-451.1594