#5309, #5310 Add load method to retrieve user entity after create and password change
change Password returns different messages for different problems
fixing problems in bulkeditor and minor
ApplicationWorkbenchAdvisor : added comments
EditPasswordElement : Added to make sure user exists in db before changing password
UserDetailElement : Disabled user text field since User is immutable
NewObjectHandler : added non-empty validator for the case of User and Group
Moved all logging and dialog functionality to the new class MessagingUtils.
Refactoring code to adapt to above change.
Added new custom error dialog - CdmErrorDialog
Added runtime exception handling to the ApplicationWorkbenchAdvisor by adding a custom status handler
taxeditor part of fix for #4121 (Changing password does not work)
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