Meta-data post initialisation

To optimize the Qt Online installer even further one way is to mark those repositories which can be post-evaluated. I.e. not during the initial repository download phase but during the phase when the repository is actually installed.

Integration is needed into:

• Packaging: ACLs to mark the needed repositories
• Qt installer back-end: to support the new attributes in ACLs
• Qt Online Installer: to utilize the information per repository