backout previous commits for now; some of this is shared with dpb and

results in problems. hints from pvk@ about what introduced the breakage
we were seeing, who confirms that this backout fixes things; comitting
early to unbreak package builds.

====
a bunch of changes, all related to error-handling:
- have Handle->register also create a proper END block, so that
individual packages don't have to, and explain the issue
- kill old Unlink/Copy code that migrated to State years ago
- commonalize try{} catch {} for pkg_add/delete and pkg_create, so that
debug works the same way in both.
- switch printing command name to the catch handler, so that exceptions
are simpler to handle

and a few comments for the hairy parts...

Members:
        OpenBSD/AddCreateDelete.pm:1.44->1.45
        OpenBSD/AddDelete.pm:1.87->1.88
        OpenBSD/Error.pm:1.33->1.34
        OpenBSD/PackageRepository.pm:1.164->1.165
        OpenBSD/PkgCreate.pm:1.160->1.161
        OpenBSD/State.pm:1.58->1.59
        OpenBSD/Temp.pm:1.34->1.35
====

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