New versions of configurations for Magritte2, Pier2 and PierAddons2

Magritte 2.0.5.1 - fixed deprecated #and:and: Pier 2.0.6.1 - PierSeaside - moved #isRestful to class-side - modified PRContentsWidget>>#onAnswerCommand: to trap MAError rather than the more general Error. - Pier-Pharo-Persistency - fixed senders of #ifNotNil: - fixed reference to WAKom PierAddOns 2.0.6.1 - Pier-Blog - fixed senders of #ifNotNil: - Pier-Setup - fixed senders of #ifNotNil: - removed legacy code - removed more legacy code Tests are green in GLASS1.0-beta.4 and Pharo1.0. One test failure in Squeak4.1 (MAExtenstionsTest>>testTimePrintOn:). Dale