remove debug stmt
Addresses regreesion introduced in 7f21e2397feb659e7b06ca8bf24794c300eed1c9

PARAM_* types for shell_values were too restrictive.
That is, PARAM_ALPHANUMEXT does not permit comman, which are used when
splitting a course into new courses consisting of more than one section.
Merge pull request #63 from lsuits/27-quirks

27 quirks