stack-db 0.3.5

A (basically) infinitely stacking & extendable CoW database that has both readonly safety and incredible write speeds at the same time.
Documentation 
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# Some ideas that I'll implement soon
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1. `Phantom Databases`: Versions of the stack-db that only contain a single heap layer and a read-only reference to a database that gets later appeneded to the source database to allow for concurrent writing to and reading from the database while remaining memory-safe.
2. `Database time machines`: Also separates the heap layer from the read-only layers but allows the database to pretend that the above layers don't exist.