Possible improvement of an error message when ruleset doesn't have/share a query function

[b1conrad]

When a sky query link is to a function which is not shared by a ruleset, the error message looks like:

{"error":"Error: Ruleset com.vcpnews.introspect does not have query function "channels""}

It ought to say "does not share" instead of have, in the case where the ruleset does have the function, but hasn't shared it.

The compiler doesn't allow sharing a function the ruleset doesn't have, so that case is taken care of there.

I'm suggesting two messages: the existing one for the case where the function doesn't exist in the ruleset, and the second one when it exists but isn't shared.