SuiteSparse 5.8.0, July 3, 2020:
* SLIP_LU v1.0.1 added: for solving Ax=b exactly. Requires
the GNU GMP and MPRF libraries.
* GraphBLAS v3.3.1: see the GraphBLAS/Doc/Changlog
* replaced UFget with ssget: affects nearly all packages:
UMFPACK, KLU, CHOLMOD, CXSparse/CSparse, etc,
but their version numbers are left unchanged since it affects
the MATLAB tests only, not the compiled libraries.
* ssget v2.2.0: better URL redirects
* updates to SuiteSparse build system