Add qtwebkit-devel to Fedora installation reqs

One more packet needed to compile on Fedora.

Signed-off-by: Miika Turkia <miika.turkia@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Don't ask confusing questions in open file dialog

Using the SaveFile dialog to open a file caused it to ask the user if they
wanted to overwrite a file when they actually tried to open an existing
file. This fixes that.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>