Ok, if you don't want to reflash you device, do not install 0.7.0, or at least don't update to it, do the fresh install, I'm not sure does that work better, but at least, if you update from 0.6 to 0.7, you can't remove it (apt-manager crashes). I don't know yet why, but that is the truth.

But anyways, it is in Extras-devel, you should know the risk

Edit: The error is in post-install script and it may get fixed in later update (tomorrow). I belive that when updating app, it should also updates the install/removing scripts and if this is done by maemo, then this bug will be fixed in update, if maemo won't do that, then the update system is bad. If you have already have install 0.7, don't remove it, that will cause the damage, wait the update (all but remove app should work perfectly :P).