Note: help and version output are generated by a naïve script which tries a few variants of
<command> --help, <command> -h etc. to find the command's help and version info.
Sometimes it gets lucky, sometimes it doesn't; if the output below looks wrong, it probably is.
gtkam --version (return code: 0)
gtkam --help (return code: 0)
-h --help Print this message
-d --debug Print debugging output
-f --fatal Make warnings fatal
-v --version Print version