with modus ponens panickers

* use bloomchain crate in blockchain module. remove obsole chainfilter submodule

* update database version to 6.0

* removed redundant line

* simple db migration

* make migration slightly more functional

* bloomchain migration

* migration version is just a single unsigned integer

* updated migration v6

* parity migration

* db migration

* removed hardcoded migration dir

* replace ptr::copy with clone_from_slice, removed potential endianess problem from trace/db.rs

* removed superfluous line

* blockchains log blooms config is not exposed any more

* Bumping clippy. Fixing warnings

* Removing unused import

* Fixing complexity and arguments warning on two functions

Fixes #1111

* easily configurable vm (in progress)

* completely removed vm_factory from engine

* --jitvm command line flag

Make Ethash::extra_info() work.
Seal fields now decode the RLP.