Fixes the combatlog break bugs that exist since patch 2.4 by simply
clearing the whole log on every update. This is required in order
to receive new log events. Otherwise, addons like Omen or Recount
won't work and simply don't receive any new data at a given time.
* Checks for redundant and incompatible addons.
* Asks the user for soft-conflicts if they want to keep it
* Saves soft-conflicts to not annoy the user on every login
* Automatically disables hard-conflicts
shagu