Add the too_many_arguments test case to cmd_about_test
Add the too_many_arguments test case to cmd_about_test

Mimic the tests in cmd_help_test and add a check for too many arguments
on the command line.

This change was r101 in Subversion.

rodrigc/kyua,rodrigc/kyua,jmmv/kyua,rodrigc/kyua,jmmv/kyua,rodrigc/kyua,jmmv/kyua,jmmv/kyua