params: add ropsten fork delay, update les checkpoints

* core/vm/runtim: benchmark create/create2

* core/vm: do less hashing in CREATE2

* core/vm: avoid storing jumpdest analysis for initcode

* core/vm: avoid unneccesary lookups, remove unused fields

* core/vm: go formatting tests

* core/vm: save jumpdest analysis locally

* core/vm: use common.Hash instead of nil, fix review comments

* core/vm: removed type destinations

* core/vm: correct check for empty hash

* eth: more elegant api_tracer

* core/vm: address review concerns

Enable constantinople on Ropsten testnet

* cmd/puppeth: fix node URL in health check

* cmd/puppeth: set external IP for geth

* cmd/puppeth: fix enode cast issue

swarm/storage/feeds: Renamed MRU to Swarm Feeds

swarm: handle errors in cmdLineOverride and envVarsOverride

cmd/swarm: correct swarm version on --help

cmd/swarm: disable export and upload tests on Windows

- Mime types generator (Standard "mime" package rely on system-settings, see mime.osInitMime)
- Changed swarm/api.Upload:
    - simplify I/O throttling by semaphore primitive and use file name where possible
    - f.Close() must be called in Defer - otherwise panic or future added early return will cause leak of file descriptors
    - one error was suppressed