SpMatrix: Add constructor for CSR format #5759

Job	Run time
check_changes / check	4s
[email protected] Release [configure 1D]	1m 9s
[email protected] Release [configure 3D]	13m 39s
[email protected] OMP Debug [configure 3D]	9m 19s
[email protected] C++17 Release [lib]	1m 28s
[email protected] C++17 1D Debug Fortran [tests]	11m 27s
[email protected] C++17 2D Debug Fortran [tests]	16m 14s
GNU@13 C++17 3D Debug Fortran [tests]	10m 10s
[email protected] C++20 OMP [tests]	18m 18s
GNU@12 C++17 w/o Fortran [tests]	13m 53s
[email protected] C++17 NOMPI [tests]	28m 4s
[email protected] Release [configure 3D]	8m 1s
GNU Plotfile Tools [tools]	1m 57s
GNU@13 C++17 [tests]	2m 56s
[email protected] HDF5 I/O Test [tests]	2m 35s
	2h 19m 14s

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