Config - defaults

- Config is now providing a default set of all configuration variables.
- The default set is used to both initialize a Config object, and to
  create a sample .taskrc.

src/tests/annotate.t

@@ -36,6 +36,7 @@ if (open my $fh, '>', 'annotate.rc')
   # Note: Use 'rrr' to guarantee a unique report name.  Using 'r' conflicts
   #       with 'recurring'.
   print $fh "data.location=.\n",
+            "confirmation=off\n",
             "report.rrr.description=rrr\n",
             "report.rrr.columns=id,description\n",
             "report.rrr.sort=id+\n";