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add threadsafe mount datastore and small fixups on keytransform

Fix interface issues and implement more things on sub-datastores

thanks to btc

Batching

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

Revert "add in support for batched writes"

add in support for batched writes

switch uuid implementation

motivation: code.google.com is going away and satori's seemd sufficient and not overly complex

measure: Unregister at Close time

This allows open-close-open cycles with the same prefix.

measure: Datastore wrapper that records metrics

Backport from go-ipfs, fix tests, hopefully fix Windows

For background, see https://github.com/golang/go/issues/3366

Here's the failure seen:

    --- FAIL: TestPutOverwrite (0.03s)
    	flatfs_test.go:118: Put fail: rename C:\Users\gates\AppData\Local\Temp\test-datastore-flatfs-679014441\7175\put- 717454915 C:\Users\gates\AppData\Local\Temp\test-datastore-flatfs-679014441/7175/71757578.data: Cannot create a file when that file already exists.

Used to error out with

    flatfs_test.go:66: Put fail: failed to open dir: fsync: The handle is invalid

It seems Windows does not want syscall.Fsync to be called on directory
handles.

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

Backported from commit e965c53780003a01fcbd94af96333ace4b3e2748 in the
vendored copy in https://github.com/ipfs/go-ipfs

Implement flatfs and mount, to support IPFS moving block storage out of LevelDB