Improve Creation of PSML pages for new users

When creating new users, the creation of that user's PSML pages needs to be improved.

User can be created from two places:

1. user registration
2. user administration

Each uses different configurations, which is bad

1. User Registration is configured by a portal property :

See jetspeed.properties:
psml.template.folder = /_user/template/

2. User Administration is configured by a portlet preference on the UserDetailsPortlet: the "newUserTemplateDirectory" pref

Unfortunately, in neither case, is this feature optional, so it will always attempt to create a directory
I plan to improve this feature so that:

• PSML template creation can be optional
• support https://issues.apache.org/jira/browse/JS2-476
• centralize configuration