Charm++ version 8.0.0

[ericjbohm]

This is a feature release, with the following major changes:

Highlights:

• The License has changed to Apache 2.0 with LLVM exception. This
  change to a popular Open Source license is intended to simplify use,
  collaboration, and greater community involvement in the development
  of Charm++. The NOTICE file contains the pertinent disclaimers.

• The CkIO library (previously only supporting file output) has been
  enhanced to support file input. The input layer enables two-phase,
  collective input from a single file via an array of buffer chares,
  which read from the file system and buffer data until the application
  requests it. As of this release, the number of buffer chares is
  not automated by CkIO, and the user is responsible for selecting
  the input decomposition for best performance.

• The OFI layer has been extended to support the CXI (Cassini)
  extensions for Slingshot-11. This can be accessed by adding the cxi
  parameter to the build line and allows for greatly improved
  performance on machines such as (Frontier, Perlmutter, Delta) at
  larger node counts. Adding cxi as a build parameter is not
  necessary on most Slingshot-11 installations, as it will be
  autodetected.

• Added support for NVIDIA's nvc/nvfortran compilers and Intel's new
  icx/ifx compilers.

• Fixed a bug in location management when doing dynamic insertion and
  deletion of chare array elements.

• Deprecated the "atomic" keyword in SDAG code (in favor of "serial").

• Added support for TLSglobals on Apple ARM systems and the ability to
  disable TLSglobals support at build-time.

• Performance optimizations for node group broadcasts.

• Added CMI-SHMEM module for optimizing small/medium-sized messages
  between processes on the same host.

• Fixed demand creation via ckcallback::send and enabled passing
  options to ckcallback::send.

• Improved portability and usability of AMPI's automatic global
  variable privatization methods.

• Transferred organization ownership of the repository on github from
  UIUC-PPL to charmplusplus.