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Currency params and main wot access

See merge request !1395

`P2pCandidate.dlPromise` promise doesn't resolve on download errors
such as socket timeouts. Each time such an error occurs, the node is lost
for the sync because the 'this.dlPromise.isResolved()' check used for
testing the node's availability never succeeds anymore for this node.

This patch hardens the blocks downloading in two ways:
* Retrying the download up to 5 times when the number of returned blocks is
  different from what was requested
* On failure returns an empty block array so that the dlPromise is resolved
  and the node failure could be handled as expected at the P2PSyncDownloader
  level triggering the `P2pCandidate.addFailure()` function.

feat: configure log level with env var

See merge request !1392

fix(bma): create endpoint with env var conf

See merge request !1391

Prepare peers db for future migration

See merge request !1388

Docker - Duniter wrapper + Entrypoint can survive a config / peers.db loss

See merge request !1387

Add new Docker environment variable: `DUNITER_PEER_HOST` (default to
`DUNITER_SYNC_HOST`).

When `conf.json` doesn't exist and `DUNITER_PEER_HOST` designs a remote
node, bootstrap currency parameters from this node into the configuration
file.

When `peers.db` doesn't exist and `DUNITER_PEER_HOST` designs a remote node,
use `sync $DUNITER_SYNC_HOST --only-peers` to have its endpoints into
`peers.db`.

And force option '--home /var/lib/duniter' in the wrapper when not given.

It should help when running an interactive shell into the instance.

feat(bma): fill field time with receivedTime for pending txs

See merge request !1386

fix(sync): when called with --only-peers

See merge request !1385

When 'sync' is called with option '--only-peers', the path to function
'RemoteSynchronizer.getPeers()' is not the same as the default.

In this case we need to ensure that 'init()' was properly called and
proceed without a watcher.

feat(bma): configure with env var

See merge request !1382

Docker: move config back to volume /var/lib/duniter and other minor changes

See merge request !1381

Moving `conf.json` from volume `/var/lib/duniter` to volume `/etc/duniter`
was a mistake. It creates to much many corner cases where one can lose
their configuration file.

This commit partly reverts fd0bbe67 by bringing conf.json back into volume
`/var/lib/duniter`.

Was /duniter/duniter.

Spare one process.