* changes: Rename saveAvailableRollback to saveRollbackData. Have RollbackData reuse RollbackInfo. Miscellaneous cleanup in RollbackStore. Rename RollbackData.inProgress to restoreUserDataInProgress.
* changes: Rename saveAvailableRollback to saveRollbackData. Have RollbackData reuse RollbackInfo. Miscellaneous cleanup in RollbackStore. Rename RollbackData.inProgress to restoreUserDataInProgress.