Lint cppo: Docstrings, warning disables

This actually disables all pylint warnings we haven't fixed because, as of now,
we don't intend to fix them.  The arg parsing is suboptimal, but if you can make
sure that existing scripts using cppo don't break by turning this into argparse
code, be my guest.  I didn't see an obvious way to do it any better than what we
have now.  When cppo is rewritten, we'll create a new runner with its own
argparse-based command parser.  Until then, I'm inclined to leave it be.

This is just part of a larger rewrite I started working on, but ... it's not
needed now.

cppo

@@ -53,10 +53,17 @@ import blocksfree.logging as logging
 LOG = logging.LOG
 
 def usage(exitcode=1):
+	"""Print script usage and exit "gracefully"
+
+	Args:
+		exitcode: The shell return value (1 is appropriate for errors)
+	"""
 	print(sys.modules[__name__].__doc__)
 	sys.exit(exitcode)
 
+#pylint: disable=too-many-branches,too-many-statements
 def main() -> None:
+	"""provide the legacy cppo CLI interface"""
 	# Setup logging
 	handler = logging.StreamHandler(sys.stdout)
 	formatter = logging.Formatter('{message}', style='{')
@@ -64,10 +71,10 @@ def main() -> None:
 	LOG.logger.addHandler(handler)
 	LOG.setLevel(logging.DEBUG)
 
-	g = blocksfree.legacy.g
+	g = blocksfree.legacy.g  #pylint: disable=invalid-name
 
 	args = sys.argv
-	while True:  # breaks when there are no more arguments starting with dash
+	while True:
 		if len(args) == 1:
 			usage()
 
@@ -151,6 +158,7 @@ def main() -> None:
 				sys.exit(2)
 
 	blocksfree.legacy.run_cppo()
+#pylint: enable=too-many-branches,too-many-statements
 
 if __name__ == '__main__':
 	main()