[stellation-res] Checkin of Stellation fixes.

["Jonathan Gossage" <jonathan@xxxxxxxxxxxxxx>]

I have checked in fixes for bugs 40892, 41890 and 41892 into a branch named
Bugzilla-40892-41890-41892. The affected projects are
org.eclipse.stellation.cli, org.eclipse.stellation.repos and
org.eclipse.stellation.util and the same branch has been created in each
project.

In addition to the bugzilla fixes, there is a fix for date handling in the
artifact agents which caused us to always use the current date.

I have also fixed some code that was generating Eclipse warnings.

I would like to have this reviewed as soon as possible since I want to get
started on the refactoring ASAP. These fixes have been in use for ~2 months
on my machine so I am pretty confident in them.

Regards

Jonathan