Makefile: call shell function to get pwd

cmd: add makecache cmd, use caches during import cmd

There is currently no simple way to obtain the network ID from a Client. 
This adds a NetworkID method that wraps the net_version JSON-RPC call.

Previously, NewManifest was asynchronous so subsequent code which tried
to use the returned manifest could error as the manifest was not yet
persisted.

This patch updates the Address type in common/types.go so that the Hex
function provides an EIP55-compliant output string. The implementation is pretty lightweight; 
on my laptop the benchmark gives 1100ns/op, with the majority of that value due to the Keccak hash.

mobile: add RinkebyGenesis method

* core: reduce txpool event loop goroutines and sync structs

* cmd, core, eth: journal local transactions to disk

* core: journal replacement pending transactions too

* core: separate transaction journal from pool

trie: typo in comment

core/vm/runtime: fix evm command to use --gasprice flag value

As per https://golang.org/s/generatedcode. This will allow other tools
such as golint to properly ignore the files.

* node: Rename TrusterNodes

* node: Rename TrusterNodes

cmd/faucet: ignore whitespace in gist content

cmd/puppeth: limit cotnainers to 10MB logs

* mobile: don't retain transient []byte in CallMsg.SetData

Go mobile doesn't copy []byte parameters, for performance and to allow
writes to the byte array be reflected in the native byte array.
Unfortunately, that means []byte arguments are only valid during the
call it is being passed into.

CallMsg.SetData retains such a byte array. Copy it instead

Fixes #14675

* mobile: copy all []byte arguments from gomobile

To avoid subtle errors when accidentially retaining an otherwise
transient byte slice coming from gomobile, copy all byte slices before
use.

* mobile: replace copySlice with common.CopyBytes

* mobile: Use EIP155Signer - closes #14762

* mobile: Correctly fall back on HomesteadSigner when no chainID is passed in

README: get rid of the non-existent disasm command

consensus/ethash, core: implement Metropolis EIP 100

Implements ethereum/EIPs#98

* core: remove redundant storage of transactions and receipts

* core, eth, internal: new transaction schema usage polishes

* eth: implement upgrade mechanism for db deduplication

* core, eth: drop old sequential key db upgrader

* eth: close last iterator on successful db upgrage

* core: prefix the lookup entries to make their purpose clearer