Change output to be more paste-friendly

Now you can double click the ( on a message send for pasting into irb.
Dump information from too-large packets

When a too-large packet is detected you get an exception but little
indication of what message was sent to cause it.  Hopefully the partial
output will be helpful in determining what type of packet it is.
Use Capp.drop_priviliges

This method was moved up to Capp where it makes more sense.