Fix actions Permission for retire in roundup/actions.py was with 'Edit' permission, not 'Retire' permission. Add a 'restore' action to roundup/actions.py. Both are now correctly used in rest.py and xmlrpc.py (the latter had some errors when printint error messages). Also reworked the rest implementation: Despite the warnings in the roundup API in hyperdb.py the DELETE http method would *destroy* and not *retire* an item. This has been fixed. We also do not allow retire of a complete class (although this was implemented) because this seems to dangerous and we see no use-case.

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