Replace old references to HBIC with HLU

Replace and old references to the namespace HBIC with the correct
namespace HLU.
Upgrade user.config in new releases

Add setting and call to function to upgrade the user.config when first
running a new release.
Amend installer to upgrade existing versions

Amend the installer so that it can upgrade any existing installed
versions rather than requiring them to be uninstalled first.