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Bumps [github.com/ipfs/go-datastore](https://github.com/ipfs/go-datastore) from 0.1.0 to 0.1.1.
- [Release notes](https://github.com/ipfs/go-datastore/releases)
- [Commits](https://github.com/ipfs/go-datastore/compare/v0.1.0...v0.1.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [github.com/ipfs/go-ipfs-blockstore](https://github.com/ipfs/go-ipfs-blockstore) from 0.0.1 to 0.1.0.
- [Release notes](https://github.com/ipfs/go-ipfs-blockstore/releases)
- [Commits](https://github.com/ipfs/go-ipfs-blockstore/compare/v0.0.1...v0.1.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [github.com/ipfs/go-datastore](https://github.com/ipfs/go-datastore) from 0.0.5 to 0.1.0.
- [Release notes](https://github.com/ipfs/go-datastore/releases)
- [Commits](https://github.com/ipfs/go-datastore/compare/v0.0.5...v0.1.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [github.com/gogo/protobuf](https://github.com/gogo/protobuf) from 1.2.1 to 1.3.0.
- [Release notes](https://github.com/gogo/protobuf/releases)
- [Commits](https://github.com/gogo/protobuf/compare/v1.2.1...v1.3.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [github.com/ipfs/go-cid](https://github.com/ipfs/go-cid) from 0.0.2 to 0.0.3.
- [Release notes](https://github.com/ipfs/go-cid/releases)
- [Commits](https://github.com/ipfs/go-cid/compare/v0.0.2...v0.0.3)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

This patch tracks two usefulness metrics: short-term usefulness and long-term
usefulness. Short-term usefulness is sampled frequently and highly weights new
observations. Long-term usefulness is sampled less frequently and highly weights
on long-term trends.

In practice, we do this by keeping two EWMAs. If we see an interaction within
the sampling period, we record the score, otherwise, we record a 0. The
short-term one has a high alpha and is sampled every shortTerm period. The
long-term one has a low alpha and is sampled every longTermRatio*shortTerm
period.

To calculate the final score, we sum the short-term and long-term scores then
adjust it ±25% based on our debt ratio. Peers that have historically been more
useful to us than we are to them get the highest score.

Run benchmarks before and after, compare results

This ensures we don't keep large buffers allocated.

fixes performance regression

tag peers in connection manager as they have outstanding requests for blocks to serve

fix #114

Uses shared external package peer task queue in place of peer request queue. Shared by graphsync.

Add comments to all exported functions, extract the utils for creating instances in testnet.go,
moves integration tests to bitswap_test

BREAKING CHANGE: removed one constant -- rebroadcastDelay -- which I believe was unused

* HasBlockBufferSize and provideKeysBufferSize no longer matter as we have an
  infinite in-memory buffer.
* provideWorkersMax now defaults to 6 so changing this to 16 actually _increases
  memory consumption.

In preparation for switching over to go modules entirely. We no longer need our
fork.

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