Add correct wxpython version to PACKAGES.txt (fixes #821)
Show default_slide if an error occurs in a slide

See #925
Fixed #897 (Use correct server time for clock/countdown on other clients)
Merge pull request #1013 from ostcar/SlideError

Show default_slide if an error occurs in a slide
Merge pull request #1016 from emanuelschuetze/fix897

Use correct server time for all clients
Merge pull request #1015 from andkit/fix-821

Add correct wxpython version to PACKAGES.txt (fixes #821)