We do automated testing before we test on infra, etc. Make that explicit.

dep: update go-bitswap to fix a memory leak

README: update minimum system requirements and recommend OpenSSL

fixes #6513

fix and improve the writable gateway

feat: add install instructions for external commands

Issue reported on IRC.

1. Fix handling of PUT. The simple implementation was the correct
   implementation, I have no idea what was going on here.
2. Use MFS everywhere to reduce code duplication and add support for sharded
   directories.
3. _Correctly_ block IPNS.
4. Remove the dependency on `core.IpfsNode`.
5. Remove support for putting empty directories with a well-known CID. It was
   useless as directories are automatically created.

fix: slightly faster gc

fix {net,open}bsd build by disabling fuse on openbsd

fixes #5334

mk: handle stripping paths when GOPATH contains whitespace

ci: only run node interop tests

make gossipsub the default routing protocol for pubsub

doc: align the early testers program description with its goal

feat: add --long as alias for -l in files.ls

Allow passing --long or ?long=true as a more descriptive option name than "l".

refs: https://github.com/ipfs/go-ipfs#issuecomment-392477565

switch to new merkledag walk functions

EnumerateChildrenAsync has been renamed to WalkParallel to reflect the fact
that:

1. It visits the root.
2. It's parallel, not async.

To mirror this change, EnumerateChildren has also been renamed to Walk and now
behaves the same (except that it's not parallel).

ci: show the commit

readme: fix CI badge

Adds Siderus in early testers

Pubsub is experimental anyways.

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