Python-graphblas

bug fix for GxB_Matrix_pack methods when the "by row" / "by column" format of the matrix doesn't match the input data being packed into it.

bug fix for C=kron(A,B) when A or B are iso but C is not.

* iso matrices and vectors added
* GxB_*_build_Scalar added: builds an iso matrix or vector
* import/export: can now import/export iso matrices and vectors
* GxB_*_pack/unpack methods added
* GrB.argmin/argmax: added to GrB interface
* GxB_PRINT_1BASED: added to the global settings
* GxB_*_memoryUsage added
* Source/Generated: split into Source/Generated1 and Source/Generated2
for faster compilation when GBCOMPACT is enabled
* port to Octave: gbmake and gbtest work in Octave7 to build and test
the GrB interface to GraphBLAS. Octave 7.0.0 is required.

* bfs and triangle counting demos: removed. See LAGraph for these algorithms.

* (26) performance bug fix: reduce-to-vector where A is hypersparse CSR
with a transposed descriptor (or CSC with no transpose), and some cases
for GrB_mxm/mxv/vxm when computing C=A*B with A hypersparse CSC and B
bitmap/full (or A bitmap/full and B hypersparse CSR), the wrong
internal method was being selected via the auto-selection strategy,
resulting in a significant slowdown in some cases.