Merge branch 'hotfix/ijv_merge' into 'master'

include/spm.h

src/drivers/laplacian.c

src/drivers/readijv.c

src/spm.c

src/z_spm.c

src/z_spm_dof_extend.c

src/z_spm_norm.c

tests/spm_tests.h

tests/z_spm_tests.c

wrappers/fortran90/src/spmf.f90

wrappers/python/spm/__spm__.py