#107 add field resolvrUsed to org.xbill.DNS.Message

[Ralf Hauser]

if such a Resolver field were present,
org.xbill.DNS.ExtendedResolver.send(Message query) could be accountable on where it got the results from, or rather org.xbill.DNS.ExtendedResolver.Resolution.start() could.

Short of that, please make the classes
- Message and
- Resolution
extensible, i.e. "protected" fields only or getter methods.

[Ingo]

Ticket moved from /p/dnsjava/feature-requests/14/