* Added tools/check_format.sh.
* Exit nonzero from format.sh if clang-format-11 not installed.
* Replace which with command -v.
* Fail check_format.sh if format.sh fails.
* Improve Jenkinsfile.
* Take exit 0 out of else in check_format.sh.
* Format flg_set.c to test new Jenkins environment.
* Fix formatter failed logic in check_format.sh.
* Format all misformatted files in master.
* Remove Summarize Problems stage from Jenkins.
I didn't realize Jenkins would not a run a subsequent stage if a
previous stage errored. This defeats the purpose of summarizing all
problems at the end, since this will only happen if there *are* no
problems.
* Use Post->Failure block to print all logs instead.
* Remove spurious semicolon in arms_hook.
rylieb