Inform people kindly and understandably when they upload a debug build to the store by accident

I built my app and ran it on the emulator. I then uploaded that click package (because I was happy with it) to the click store, and it was rejected with messages:

 found unexpected Exec with architecture 'all': ./qtcdevicedebughelper.py
 (REJECT) reserved policy group 'debug': not for production use

This is because I uploaded the run-on-the-emulator click package, rather than using the Publish tab in Ubuntu SDK to make a proper release build and uploading that.

However, it's hard to tell that that's what the problem was. The store front end could be a lot more helpful here; in particular, in this situation, the store could say something like:

Rejected because you uploaded a debug build of your app. Debug builds are made to test your app on devices and emulators; to upload to the store, you need to create a release build. The Publish tab in Ubuntu SDK lets you create a release build click package; increase your version number and then create a release build click package from the Publish tab and then upload it to successfully publish to the store.