Disable the version-based persistence deleting. Allow not creating a fresh ripresult when getting one.
* morituri/rip/debug.py: * morituri/test/test_common_cache.py: Add rip debug resultcache list to list cached results.
* morituri/test/cache (added): * morituri/test/cache/result (added): * morituri/test/cache/result/fe105a11.pickle (added): * morituri/test/test_common_cache.py (added): * morituri/common/Makefile.am: * morituri/common/program.py: * morituri/test/Makefile.am: Extract ResultCache object into separate file.