Python-graphblas

* major change to build system: by Markus Mützel

* (49) bug fix: GrB_mxm saxpy4 and saxpy5 had incorrectly handling of
typecasting in v8.0.0 to v8.2.0 (caught by Erik Welch)
* cross-compiler support: replace check_c_source_runs with _compiles,
for GraphBLAS and SuiteSparse_config, and remove check for
getenv("HOME").
* cmake update: add "None" build type, from Antonio Rojas, for Arch Linux
* (50) bug fix: remove undefined behavior in Source/GB_add.c (Cnvec_nonempty), caught by Yves Vandreissche, Intel

* cmake updates: SuiteSparse:: namespace by Markus Muetzel
* GB_VLA_MAXSIZE: increased to 1024; only affects compilers not
supporting variable-length arrays (MSVC)

* added -DJITINIT=option: use -DJITINIT to set the initial state of
the GxB_JIT_CONTROL (4:on, 3:load, 2:run, 1:pause, 0:off). The default
is 4 (on) if the JIT is enabled, or 2 (run) if -DNJIT=1 is set.

* (48) bug fix: GrB_*_nvals returned UINT64_MAX ('infinity') for a
GrB_Vector of size n-by-2^60; it should return 2^60.
Caught by Erik Welch, NVIDIA.
* added GxB_Context_error and GxB_Context_wait
* C++: changed complex typedefs for C++ that include GraphBLAS.h;
update from Markus Muetzel

* version 8: This version is a major SO version increase, since
it removes a few minor user-visible features from SuiteSparse:GraphBLAS:
the GrB_Descriptor no longer supports threading control, and some
features of the GxB_SelectOp are removed (see below). Enum values have
been changed for compatibility with the upcoming GrB_set/get features
in the V2.1 C API.
* The JIT: GraphBLAS v8.0.0 now includes a JIT for the CPU kernels, which
can compile kernels at run time. Added GxB_set/get options and
environment variables to control the JIT. The GxB_*Op_new methods can
accept NULL function pointers, if the strings are provided and valid.
* GxB_Type_new: the size of the type can be given as zero,
in which case the size is determined via a JIT kernel.
* GxB_UnaryOp_new, GxB_BinaryOp_new, and GxB_IndexUnaryOp_new: the function
pointer can be given as NULL, in which case the function is created by
the JIT.
* math kernels: revised for CUDA JIT. More accurate complex
floating-point for Mac OS on Apple Silicon.
* Demo/wildtype_demo: change to double so that CPU and GPU versions compute
the same result.
* GxB_get: can return malloc/calloc/realloc/free functions
* GxB_Context: an object for controlling computational resources:
of OpenMP threads, the chunk factor, and (draft) GPU id.
* GrB_Descriptor: removed ability to control of OpenMP threads from the
descriptor (a rarely used feature). Replaced with the GxB_Context
object.
* GxB_SelectOp: GraphBLAS no longer supports user-defined GxB_SelectOps.
Use a GrB_IndexUnaryOp instead. The GxB_SelectOp_new and
GxB_SelectOp_free functions are removed entirely. The built-in
GxB_SelectOps, GxB_Matrix_select, GxB_Vector_select, and GxB_select
still work. However, the GxB_EQ_THUNK, GxB_EQ_ZERO, GxB_NE_THUNK, and
GxB_NE_ZERO operators no longer work on user-defined types, as they did
in v7.4.4 and earlier. Create a user-defined GrB_IndexUnaryOp to
compute these operations instead, and use GrB_select.
* alternative/Makefile: removed; incompatible with the JIT
* zstd: upgraded to v1.5.5 (Apr 4, 2023)