display no network and no location msgs if declared

[Kyle Nitzsche]

Currently agg scopes can independently declare that they want a message to the user on No Network and on No Location.

The current implementation signals the hints scope view subsearch() with a specific query_string to get these results.

But, this only works for agg scopes that use hints. Other scopes have no means to display these messages.

And, it is unnecessarily complex: a subsearch of a child scope should not be needed.

So: scope aggregator should take responsibility for this.

[Kyle Nitzsche (knitzsche)]

Fixed with scope-agg 1.5.24.

Using hints to display no network & no location messages is still supported.

One can now declare "message_on_no_network": "true". Agg scope will display no network message itself, localized. hints is not used.

One can now declare "message_on_no_location": "true". Agg scope will display no location message itself, localized. hints is not used.

These two when "true" preempt the existing declarations:
"display_hints_on_no_network": "true"
"display_hints_on_no_location": "true"