Bug Fixes, Unit Tests

- Fixed bug where "foo:bar" was not recognized as an attribute, and
  generated an error rather than demoting is to part of the description.
- Fixed bug where en-passant deltas were applied only to the first task
  in a sequence.
- Fixed various unit test.

src/tests/default.t

@@ -34,7 +34,7 @@ use Test::More tests => 16;
 if (open my $fh, '>', 'default.rc')
 {
   print $fh "data.location=.\n",
-            "default.command=list\n",
+            "default.command=rc:default.rc list\n",
             "default.project=PROJECT\n",
             "default.priority=M\n";
   close $fh;