* Temp storage for the private state added
* Temp storage for the private state added
* Request message added
* Store and retrieve offchain state logic
* State sync cache
* Private state column added to key value db
* Private state column added to key value db
* Indexing stored states via its hash
* Works with errors changed
* Private state stored into the local db
* Access to private state db added to sync io
* Private state db file added
* Rlp packets for retrieiving private state data added
* Handling of private sync completed message
* Test code fixed
* External flag for offchain storing added
* Test for private state sync added
* Saving private state logic corrected
* Migration code corrected
* Fixes after merge with master
* Merge with head
* Additional checks for slices
* Log for private state retrieval added
* Limit time of retrieving private states
* Store required hashes for every request, mark them stale if needed
* Store requested private state hashes and check received data
* Log stale requests
* State insertion fix
* Refactoring of how logging passed to state store
* Heapsize removed, syncing hashes structure reworked
* Check state length returned by contract
* Get rid of OverlayDB
* hash-db version updated
* Test fixed
* One more test fixed
* Verify private transaction before propagating
* Private transactions queue reworked with tx pool queue direct usage
* Styling fixed
* Prevent resending private packets to the sender
* Process signed private transaction packets via io queue
* Test fixed
* Build and test fixed after merge
* Comments after review fixed
* Signed transaction taken from verified
* Fix after merge
* Pool scoring generalized in order to use externally
* Lib refactored according to the review comments
* Ready state refactored
* Redundant bound and copying removed
* Fixed build after the merge
* Forgotten case reworked
* Review comments fixed
* Logging reworked, target added
* Fix after merge
* Update `add_license` script
* run script
* add `remove duplicate lines script` and run it
* Revert changes `English spaces`
* strip whitespaces
* Revert `GPL` in files with `apache/mit license`
* don't append `gpl license` in files with other lic
* Don't append `gpl header` in files with other lic.
* re-ran script
* include c and cpp files too
* remove duplicate header
* rebase nit
