DLS Product: Removed features and plugins

Removed javax.mail from o.c.product.feature/feature.xml
Removed com.google.common from o.c.product.feature/feature.xml

Removed libs.feature from cs-studio.product
DLS Product: Changes to product pom repository

Update products/DLS/pom.xml to use luna rather than kepler.
DLS Product: Disabled automatic updates.

These were failing and periodically showed exceptions when
updates were attempted.
DLS Product: Change product name to get --launcher.openFile to work.
DLS Product: Customised for DLS nightly build
DLS Product: Added some features to o.c.product.feature

* o.c.opibuilder.widgets.edm
* o.c.archive.reader.fastarchiver
* o.c.utility.pvmanager.pva
DLS Product: Use external p2 repositories
DLS Product: Added fa-archiver to databrowser URLs
DLS Product: Enable databrowser auto-scale on as default