Disable warnings that flood the output otherwise.
Implement sendtoname in the Qt UI.

Allow entering names into the "Pay To" field in Qt, to mimic the
"sendtoname" functionality.
Update changelog for the patch.
Check sendtoname recipients with regex.
Add "id/namecoin" to tooltip / example text for "Pay To" field.
Update expected format of send-to-name recipient.

Update the expected/allowed format for send-to-name recipients.
See https://forum.namecoin.info/viewtopic.php?f=5&t=1893.
Merge pull request #123 from domob1812/qt-sendtoname

Implement "sendtoname" in Qt UI (sendtonameUI)