[ENH] Adds 2 new parameters for feedback() in  tiki-query.js. One is killall, to remove other feedbacks upon the insertion of this one (Useful if lots of feedbacks coming out in same page dynamically with jQuery). Second is custom target for the feedback, so you can select other place than the default feedback div. (I guess is better than creating a new function just for this). *The killall removes only the feedbacks in the target where it is inserted, not the whole page’s feedbacks (guess its more logical this way).