METIS

Modernizes CMakeLists.txt to work across operating systems and compilers.

cmake --workflow --preset default

which creates build/libmetis.a

integer size, real size

By default, metis.h uses 32-bit integer and real. Each can be independently set to 32 or 64 bits like:

cmake -Bbuild -DIDXTYPEWIDTH=64 -DREALTYPEWIDTH=64
cmake --build build