fix data service bugs; add timeout

[wardbell]

Fixed numerous bugs in the data service area discovered while adding timeout to the data service including:

• comments in dispatcher said the exact opposite of what is going on
• used entity.id when the PK might be named something else (must use selectId().
• wrong method return types
• passed arg to getAll that does nothing.
• now pass more useful info about the request (RequestData) to handleError for debugging.

Why did I add timeout in the first place? Because it hung today, trying to reach the remote and I had locked up processes everywhere. The timeout would free to the app to keep going (and you can go back to local).

I looked into cancel for a while. Don't know how the user would call it. So that's a future.

[johnpapa]

Lgtm