* core: return error if repair block failed

* make error a bit shorter

- Have `${DataDir}/bzzd.ipc` as IPC path default.
- Respect the `--datadir` flag.
- Keep only the global `--ipcpath` flag and drop the local `--ipcpath` flag
  as flags might overwrite each other. (Note: before global `--ipcpath`
  was ignored even if it was set)

fixes ethersphere#795

trie/database: fix overflow in parent tracking

* params: Add Constantinople block to AllCliqueProtocolChanges

* params: Add Constantinople block to AllEthashProtocolChanges

core: better side-chain importing

* core/blockchain: better printout of receipts in bad block reports

* fix splleing

This should reduce the occurences of travis failures on MacOS

Also fix some linter warnings

Debug traces to investigate a travis issue on MacOS

So that we only see the log message when we actually have to migrate.

downloader: different sync strategy

* trie: return hasher to pool

* trie: minor code formatting fix

* swarm: completed 1st phase of swap accounting

* swarm: swap accounting for swarm with p2p accounting

* swarm/swap: addressed PR comments

* swarm/swap: ignore ErrNotFound on stateStore.Get()

* swarm/swap: GetPeerBalance test; add TODO for chequebook API check

* swarm/network/stream: fix NewRegistry calls with new arguments

* swarm/swap: address @justelad's PR comments

* consensus/clique: fix comment typo

* eth,eth/downloader: fix comment typo

cmd, core, eth, light, trie: add trie read caching layer

Changed "signTransactions" to "signTransaction"

Changed "send" to "send," in two places

whishes --> wishes