[Therion] xtherion crashes with tcl8.4

I've just discovered that xtherion only actually works with tk8.5, not tk8.4. Is that expected? If you only have tk8.4 installed it dies with a segfault whilst loading fonts during startup. If the authors don't expect it to work with tk8.4 then that's fair enough but I need to change the dependencies so people don't end up trying to use it. Alternatively I can provide details of the crash so we can make sure it _does_ work with 8.4. Wookey -- Principal hats: Linaro, Emdebian, Wookware, Balloonboard, ARM http://wookware.org/