print command

[Michael Godfrey]

Rik,

There seem to be good reasons for coding print() to always
do the printing with visible off for qt and fltk:

1. This avoids the window flickering that seems to accompany the
    printing (if it works at all).
2. This avoids possible problems with graphics hardware versions.
3. There may be some efficiency loss due to not using hardware,
    but this should be minor in nearly all cases.
4. This is the only mode that works in the current system.

So, for the next incremental release, this could be implemented.
Then, if most of the problems with the software get fixed the change
back to running with visible on could be turned back on.

As a minimum this would reduce many complaints from users who
try print xxx and see a crash (often seg fault).

Just a suggestion...

Michael