ongoing frysk.proc.ptrace refactoring

[Andrew Cagney <cagney at redhat dot com>]

Just a work-in-progress update:

While I've finished restructuring the target specific frysk.proc code 
into separate frysk.proc.corefile, frysk.proc.dummy and 
frysk.proc.ptrace packages there's still a ways to go as the refactoring 
has helped clarify several additional problems with the current code:

-> frysk.proc.Proc and frysk.proc.Task seem to have gained a number of 
fields, such as Task.sig_send, that are very Linux/ptrace centric; 
the'll need to be cleaned up

-> many of the methods, such as frysk.proc.Task.sendContinue, being 
ptrace specific (they do not apply to a corefile proc), can be moved to 
more specific packages

-> rather than split along the lines of "corefile" and "ptrace", a 
better split might be "dead" (you can query a dead proc) and "live" (or 
stateful) (you can observe a live proc), re-consider that once the more 
pressing issues are addressed

I'll be continuing with this.

Andrew