Added unittest for checking for invalid aliases in generated code for #2357
Replacing all '.' (dots) with underscore when generating classaliases. Fixes #2357
Merge branch 'develop' into issue/2357
Merge branch 'issue/2357' into develop
Added check for number of gateway workers in get_clients_available.
Merge branch 'develop' of https://github.com/Starcounter/Starcounter into develop
More preparation for the Appstore.

Added the ability to Install/Upgrade/Uninstall/Start/Stop an appstore application
Added counter of how many updates is available.
Added "Store" level for applications (The AppStore can contain many "Stores")
Added Installed application Icons (they are unpacked to "appImages" folder under the administrator "scadmin".
Merge branch 'develop' of github.com:Starcounter/Starcounter into bug/PreserveColumns1766