all: switch gas limits from big.Int to uint64

internal/ethapi/backend.go

@@ -37,13 +37,14 @@ import (
 // Backend interface provides the common API services (that are provided by
 // both full and light clients) with access to necessary functions.
 type Backend interface {
-	// general Ethereum API
+	// General Ethereum API
 	Downloader() *downloader.Downloader
 	ProtocolVersion() int
 	SuggestPrice(ctx context.Context) (*big.Int, error)
 	ChainDb() ethdb.Database
 	EventMux() *event.TypeMux
 	AccountManager() *accounts.Manager
+
 	// BlockChain API
 	SetHead(number uint64)
 	HeaderByNumber(ctx context.Context, blockNr rpc.BlockNumber) (*types.Header, error)