suggestion

[Harry Thijssen]

Hi

There are problems with yelp on many platforms which prevents the
users of reading the manual on there computer.

For the time being, I suggest to change the error message on line 241
in src/ui/gui/helper.c from
 "Cannot open reference manual: %s"
in something like
 "Cannot open reference manual. This is a known problem. Please check
the manual on http://www.gnu.org/software/pspp/manual/pspp.pdf";

This way users won't report the problem anymore I hope.

What do you think of this?

Have fun