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Due to patent concerns in closed-source downstream products:
https://github.com/ipfs/go-ipfs/issues/6590

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

gx publish 0.1.6

use datastore.GetSize

make arccache.GetSize return ErrNotFound when not found

(and fix the tests)

The semantics were changed during PR review but the test never got updated.

fix test race condition

Fix typo: Change 'should not' to 'should'

correctly convert the datastore not found errors

blockstore: Adding Stat method to map from Cid to BlockSize

Also stop exposing functions that don't do what they claim to do:

* Invalidate does, technically invalidate. However, it's not threadsafe.
* Rebuild doesn't *clear* the filter so it's only useful for the initial build.
  It's also not threadsafe.

We can restore these functions later if we need them (but we'll have to change a
few things to make them work properly).

Also adds a `Wait` function to allow waiting for the bloom filter to finish
building.

fixes #6