                                 IMPORTANT

     The test of stdchans MUST be done before ANY OTHER class is tested as it contains the minimum dependence on other classes except FILE_SYS -- of which it is the simplest user and which, if there are errors in the first two tests, is most likely to be the source of the problem.

     If the first two tests of STD_CHANS are successful then single character output is OK!  If subsequent tests fail then this is most likely to be due to an error in the elt! iter of STR -- which should be carefully checked first, before checking that the append routine in STD_CHANS has no error.