* add interop launcher scripts
* stick validator_keygen into beacon_node
* fix lmd ghost slot number on missing block
* use mocked eth1data when producing blocks
* use bls public key method for withdrawal credentials
* fix deposit domain
* prefer lowercase for a bunch of toHex
* build simulation binary in data folder to avoid data types confusion
* handle LFS fixtures for the test suite
* test_fixture_ssz_static.nim: allow the tests to fail properly
- switch to a debug build for the failing tests
* try -d:debug
- added a "quitProc" for shutting down the p2pd process, after seeing it
survive an unhandled exception (this required a global var for the
DaemonApi instance)
- Makefile testnet0/1 targets now depend on the "p2pd" binary
- prefixed the testnet command line in the build script message with
"../../env.sh" so it can find the superproject's "p2pd"
- updated README.md
- beacon_chain.nimble: accept compilation flags as params
- nim.cfg: enable `--opt:speed` at the top level
- simulation scripts: allow overriding GIT_ROOT and do some refactoring