Parse test commands in a .cton file.
Parse test commands in a .cton file.

The top-level parse_test() function now parses test commands in the
preamble of a .cton file.

stoklund/cretonne,sunfishcode/cretonne,sunfishcode/cretonne,sunfishcode/cretonne,stoklund/cretonne,stoklund/cretonne