- Improved multi-tenant support for multiple schools with new methods in UserService (also renamed from UserRegistrationService)
- Bootstrap.groovy - added new users to associate to parent records
- UserRegistrationCmd - simplified logic for custom validators
- UserRegistrationController - introduced userService to create and authenticate new users
- added User to Parent domain
 - messages.properties - minor update to user name error message
 - PersonalService - introduce userService to assign user to parent
 - PriorityOverride and PriorityService - replace schoolService with userService to find school for current user
 - removed obsolete SchoolService
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