Collected small changes and fixes

[akohlmey]

Summary

This pull request combines multiple small sets of changes to fix issues or refactor/update code and documentation

Related Issue(s)

N/A

Author(s)

Axel Kohlmeyer, Temple U

Licensing

By submitting this pull request, I agree, that my contribution will be included in LAMMPS and redistributed under either the GNU General Public License version 2 (GPL v2) or the GNU Lesser General Public License version 2.1 (LGPL v2.1).

Backward Compatibility

N/A

Implementation Notes

The following individual changes are included:

• integrate cross-compilation of Plumed2 lib for enabling PLUMED package support for Windows
• handle changes in Linux distribution naming to correctly detect newer versions of Fedora Linux
• detect even faster "mold" linker when testing is enabled on top of "gold" and "lld".
• Update KOKKOS compilation docs since nvcc_wrapper no longer needs to be set as C++ compiler with KOKKOS/CUDA
• fix copy-n-paste issue in fix wall/gran docs
• some reformatting with clang-format
• silence compiler warnings
• improve error messages in some region commands

Post Submission Checklist

• The feature or features in this pull request is complete
• Licensing information is complete
• Corresponding author information is complete
• The source code follows the LAMMPS formatting guidelines
• Suitable new documentation files and/or updates to the existing docs are included
• The added/updated documentation is integrated and tested with the documentation build system
• The feature has been verified to work with the conventional build system
• The feature has been verified to work with the CMake based build system