Enhancement Request: implement `dill` unpacking for `springform`'d objects

[dluman]

Mark the library (libraries) to which the enhancement applies

• couchsurf
• gitit
• helper
• inventory
• marketplace
• narrator
• resources
• worldlib
• notary

Describe the desired enhancement

Convert inventory to use the dill module, making it compatible with the future springform module.

[dluman]

Combined with #105, this might store dill binaries in the table, though there's no way to know how large a given object might be. Could be bad idea.