[Pharo-project] Issue 722: some methods missing in BlockClosure

I added missing methods for issue http://code.google.com/p/pharo/issues/detail?id=722 in PhaoInbox/Services-Base-nice.48 and PharoInbox/Kernel-nice.renggli.289 (I did not make a SLICE) These two preserve author name and date from BlockContext since they are pure copies of code. PharoInbox/Kernel-nice.renggli.289 also merge PharoInbox/Kernel-nice.renggli.288 which solve http://code.google.com/p/pharo/issues/detail?id=726 (missing BlockClosure>>#sender) It does not merge Michael changes about events. Nicolas