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Cleanup.  Re-lower the tolerance in TestNoCluster,

Provide utility to convert from one Sharding type to another.

This also means that it is no longer possible to report the estimate time
left.

Store sharding function used in the repo.

Other minor cleanups.

Also use *ShardIdV1 instead of string for the shard fun parameter to
WriteShardFunc and WriteReadme.

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.

Add test to make sure suffix sharding prevents prefix clustering.

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

Closes #8

Add support for NextToLast shard function.

coverage: switch to codecov

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