fixed bug on validation of datefield, emailfield, numericefield.
make CMS validation enabled.
git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/sapphire/trunk@40755 467b73ca-7a2a-4603-9d3b-597d59a354a9
Added doWrite option to duplicate, so that writing can be disabled on a duplicated node
Added augmentBeforeWrite, so that extensions can do more onBeforeWrite stuff
Added set_context_obj() so that objects can give some 'context' to the decorators during particular operations
Created a super-class of DataObjectDecorator, Extension that isn't specifically targetted at DataObjects
git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/sapphire/trunk@40226 467b73ca-7a2a-4603-9d3b-597d59a354a9
