removed unused devtools

Revert "Revert "revert "relay canonized blocks"""

Revert "revert "relay canonized blocks""

This reverts commit edbdf4fb.

This reverts commit 0d8bfc8e.

fix iterator in indexed blocks

b41 and b42 are correctly validated

Suppress RepresentH256 until it is used

Relay canonized blocks to sync peers when in saturated/nearly saturated state

Indexed/hashed chain blocks

Get rid of verification waiter

Reverify transactions from decanonized blocks

Configurable db cache size

Rely on p2p sync

Check that all blocks hashes are unknown before adding to `SCHEDULED_QUEUE`

Sync client can now use different verifiers (async && dummy, etc.)

Cleaning