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Other minor cleanups.

This avoids the need for the special "auto" string for the shard func.

Store the sharding function used in the file "SHARDING" in the repo.
To make this work the sharding function is now always specified as a
string.

This is done by fixing the Rand source to use a seed for deterministic
results and increasing the number of keys used.

Closes #8

Also fix bug when only the Prefix function was being tested in most cases.

Ignore non-directories in the top level directory to allow placing a
README or similar file there.

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protonmail.ch>

implement batch ops for different datastore types

rename Transaction to Batch

Revert "add in support for batched writes"

add in benchmarks for put and batchput

move batching into separate interface

address concerns from PR

regrab old code

Previous commit made flatfs strip first byte of keys (under the
assumption that datastore always makes it be "/").