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This directory contains checker scripts and other files they need.
Each checker script is assumed to be run from tox,
when working directory is set to ${CSIT_DIR}.
Each script should:
+ Return nonzero exit code when it fails.
++ The tox might ignore the code when the check is not blocking.
+ Write less verbose output to stderr.
+ Write (to stderr) PASSED or FAILED to help with debugging.
+ Direct more verbose output to appropriately named .log file.
+ Only the output suitable for automated processing by an external caller
  should be written to stdout.
++ The level of "less verbose" depends on check and state of codebase.
+ TODO: Should we carefully document which files are
  whitelisted/blacklisted for a particulat check?