kalu could crash on sysupgrade under certain circumstances, fixed. Couple minor changes.
- When performing a sysupgrade through kalu's updater, when (new) optionnal dependencies were to be listed, kalu would crash. Note that "only" kalu (aka the GUI) would crash, the updater part would still run fine and complete the upgrade, as the log (pacman.log) would show. Still pretty bad, and fixed. - When starting a sysupgrade, the message in the log (pacman.log) is now "starting sysupgrade" to be more consistent with the message upon completion ("sysupgrade completed") - Now using a mark in the GtkTextBuffer to scroll down when adding stuff to the log, as that seems to work better.