After loading this file, all output to stderr from WINTERP and
it's subprocesses (via exp_popen exp_spawn system popen) gets
output to a XmText widget. If popped-down, this window pops
up upon new activity on stderr.
NOTE: the code in this file (redir-err.lsp) works only with
Motif versions >= 1.2; for older versions of Motif (1.0, 1.1),
the file redir-err0.lsp is automatically loaded from this file.