* Updated source file copyright headers to remove "Copyright by the Board of Trustees
of the University of Illinois", which is kept in the top-level COPYING file.
* Committing clang-format changes
* Fixed various -Wdouble-promotion warnings
* Fixed -Wshadow warning for `optopt` conflict
On macOS at least, there is a global various named `optopt` in unistd.h.
* Committing clang-format changes
Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>
Adds missing HD prefixes to API calls in src and test.
Adds some extra processing to bin/checkposix to keep the noise
levels down when running the script (not comprehensive).