Refactor getL1L2TxSelection, which fixes some problems for certain
combinations of txs.

Updated:
	batchbuilder
	common
	coordinator
	db/statedb
	eth
	log
	node
	priceupdater
	prover
	synchronizer
	test/*
	txprocessor
	txselector

Pending (once
https://github.com/hermeznetwork/hermez-node/tree/feature/serveapicli is
merged to master):
	Update golangci-lint version to v1.37.1
	api
	apitypes
	cli
	config
	db/historydb
	db/l2db

- Add AmountF new parameter to ZKInputs
- Update ZKInputs test vectors with float40 checked with circom circuits
- Small fix at eth/rollup.go with lenL1L2TxsBytes with new length of
Float40

- TxProcessor move txCompressedDataEmpty inside the if of tp.zki!=nil
- Abstract generation of transactions for ZKInput tests to avoid code
repetition
  - used at txprocessor & test/zkproof tests