- Moving Flap classes to World package + removing MorphicExtras-Flap - Added pasterUpMorph topPasteUp reserveUrl as extension in PasteUpMorph (but this is limited since via the owner chain we can get to the a pasterUpMorph). - Merging SqueakPages in MorphicExtras-Books - Moving previousOwnerPage and nextOwnerPage as extension of MorphicExtras-Books - Move ThumbnailMorph from Books to Morph-Basic - Move releaseSqueakPages as extension of MorphicExtras-Books - introduced new hook when a morph is loaded from file (postLoad) -> removed one isKindOf: and hardcoded class. - saveOnURL: and saveOnURLbasic are now extensions of MorphicExtras- Books Stef and Jannik