PropertySupport: remember to call validator
PropertySupport: 'writeable' s/b 'writable'

This is the spelling used by JavaScript property descriptors.
PropertySupport: change 'default'->'defaultValue'
PropertySupport: fix bug in propertiesHavingType()
WIP adding PropertySupport to MD2D modeler
PropertySupport: add deleteComputedPropertyCachedValues
PropertySupport: that's 'defineProperty' you want
Add 'storeInTickHistory' property to metadata
Allow TickHistory to use simplified interface
PropertySupport: includeInBulkSave -> includeInHistoryState
PropertySupport: add rawValues property for all raw values
PropertySupport: fix typo
Major surgery to use PropertySupport in MD2D
PropertySupport: fix validateDescriptor