pushed User type out of Reffit.Types into its own module.  More free space to monkey with SafeCopy
Document and OverviewComment modules added.  Next I need to move over whatever AcidTypes functions (like AddUser) I can into those modules
more reorganization
removing DataTypes tiny module.  Different parts of the PersistentState can now be in different versions.
delete DataVersion.hs
Merge pull request #7 from ImAlsoGreg/reorganizeTypesAcidTypes

Reorganize types acid types