[DS-1230] Aging tool to discover disused accounts

https://jira.duraspace.org/browse/DS-1230

Also includes a loader to recover last-login dates from log files.
I get an Exception here:
/bin/dspace dsrun org.dspace.eperson.Groomer -a -b '04.08.2014 00:00:00'
Exception: Attempting to insert unknown datatype (java.util.Date) into SQL statement.
java.sql.SQLException: Attempting to insert unknown datatype (java.util.Date) into SQL statement.
        at org.dspace.storage.rdbms.DatabaseManager.loadParameters(DatabaseManager.java:1560)
        at org.dspace.storage.rdbms.DatabaseManager.queryTable(DatabaseManager.java:218)
        at org.dspace.eperson.Groomer.aging(Groomer.java:106)
        at org.dspace.eperson.Groomer.main(Groomer.java:69)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.dspace.app.launcher.ScriptLauncher.runOneCommand(ScriptLauncher.java:225)
        at org.dspace.app.launcher.ScriptLauncher.main(ScriptLauncher.java:77)

The DatabaseManager uses java.sql.Date and not java.util.Date. A java.sql.Date can be created easily using new java.sql.Date(before.getTime().