PRD-4965 - The handling of resource-managers and resource-bundles on Sub...

...reports were messed up.

Subreports have no good and sensible way of declaring their own resources - they share the master-reports
bundle and thus should share the master-reports resource loader. I deprecrated all APIs that suggest that
subreports have an own resource management and moved all code into the master report. All code that
works on subreports now uses the master-report's resource-manager and resource-bundles instead.