* new index and structure in db_store
* syncronisation: iterator more efficient
* syncer history sync is simplified
* swarm/api: fix tests
NOTE: this represents an interim fix until
network layer rewrite is complete
Update cleandb.go
Just a comment, not to forget fixing this.
Update dbstore.go
Added a TODO comment to refactor the database constructor.
swarm/storage: Adding bucketed chunk counters to chunk database
cmd/swarm: cleandb now takes proper PO function based on bzzaccount
swarm/storage: fix bucketcount stats in dbstore
swarm/storage, cmd/swarm: add db dump as command
* accounts, cmd, eth, ethdb: port logs over to new system
* ethdb: drop concept of cache distribution between dbs
* eth: fix some log nitpicks to make them nicer
* swarm/network: integrity on incoming known chunks
* swarm/network: fix integrity check for incoming chunks
* swarm/storage: imrpoved integrity checking on chunks
* dbstore panics on corrupt chunk entry an prompts user to run cleandb
* memstore adds logging for garbage collection
* dbstore refactor item delete. correct partial deletes in Get
* cmd/swarm: added cleandb subcommand
