makes new directory
createdir(dirname)
status = createdir(dirname)
:dirname a character string. : :status a boolean. :
`createdir(`dirname`_)` creates the directory dirname in the current directory, if dirname is not in the current directory, specify the relative path to the current directory or the full path for dirname.
`[status] = createdir(`dirname`_)` creates the directory dirname in the existing directory, returning the status. Here, status is %T for success and %F otherwise.
createdir is used by mkdir.
createdir(TMPDIR+'/Directory_test')
`removedir`_(TMPDIR+'/Directory_test')