Removes about 900 checkstyle errors from the Security Service (except the
impl.db package), reducing the number of errors not counting deprecation,
non-matching licenses and lines longer than 80 chars to zero.
(Happy now, Jon? ;-) )


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Properties for setting the classes of the User, Group, Role and
Permission objects added. Objects are instantiated with a Factory and
can be changed at run time.

Property for configuring the AccessControlList class added,
AccessControlList is now an interface (Warning, if you get
IncompatibleClassChange errors, you have to recompile your application
with the new Fulcrum!) and an implementation is separated and
configureable.


PR:
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Submitted by:
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Strings.isValid was renamed to Strings.isNotEmpty