Update older md5 checksums to sha256. Require CMake >= 3.6.0 (updated
from 3.5.0). Remove some third-party depends_on statements (which
were commented out before).
- remove the old LGPL license headers from all files in Spack
- add SPDX headers to all files
- core and most packages are (Apache-2.0 OR MIT)
- a very small number of remaining packages are LGPL-2.1-only
Adds the first stable API release of ADIOS2, v.2.1.0.
Also adds a missing `pybind11` CMake flag for proper Python
selection (needed in both the new and previous version).
Adds ADIOS2, the C++ Exascale HPC I/O rewrite of ORNL's ADIOS
library.
Currently, many variants (especially for data transforms such as
compression) are not yet added. It already provides Python bindings.
