build(fpm.toml): rm unnecessary project metadata

doc(README): distinguish LLVM 19 vs 20 in fpm test

This commit updates the README.md file to explain that two
experimental flags required with LLVM 19 are not required with
LLVM 20.

Add ASSERT_PARALLEL_CALLBACKS define

By default, assert uses `THIS_IMAGE()` in multi-image mode while
composing assertion output, and invokes `ERROR STOP` to print the
assertion and terminate execution.

The ASSERT_PARALLEL_CALLBACKS preprocessor flag enables the client to replace
the default use of these two Fortran features with client-provided callbacks.
To use this feature, the client must build the library with `-DASSERT_PARALLEL_CALLBACKS`,
and then at startup set the `assert_this_image` and `assert_error_stop`
procedure pointers to reference the desired callbacks.

Tagging updated 2.0.0

Merge pull request BerkeleyLab#27 from sourceryinstitute/update-versi…

…on-no-in-manifest

Update version number in fpm manifest

Merge pull request BerkeleyLab#22 from sourceryinstitute/restart-cray…

…-workaround

Work around Cray Compiler Environment (CCE) 17.0.0 bugs

Merge pull request BerkeleyLab#20 from sourceryinstitute/increment-ve…

…rsion

feat(fpm.toml): increment version to 1.5.0

Merge pull request BerkeleyLab#18 from sourceryinstitute/eliminate-wa…

…rnings

Eliminate compile-time warning messages

Merge pull request BerkeleyLab#9 from sourceryinstitute/nag-workaround

Build with the NAG compiler

Merge pull request BerkeleyLab#8 from sourceryinstitute/nag-workaround

Add multidimensional array support and work around missing assumed-rank in NAG