Log Message:
Update from version 1.1902nb1 to 1.2000 (upstream 1.20).
(I hope the maintainer won't mind.)

Pkgsrc changes:
 o Add the "00" suffix to ensure we don't decrease the version number

Upstream changes:

1.20  Oct 25, 2008

- The change in 1.15 to object creation broke the no_refs feature,
  causing references to be stored until the trace's frame objects were
  created.

* Exception::Class objects are always stringified by calling
  overload::StrVal().