Change --gas=simulate to --gas=auto when sending txs

[alessio]

Users may be confused by the flag --simulate and the simulate value of the --gas flag.

--gas=simulate sets the gas to estimated value returned by the simulation that runs before the tx is executed. Conversely, --simulate just triggers the simulation without eventually execution the transaction.

Hereby I propose to change the simulate value accepted by the --gas flag to auto.

@fedekunze

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[fedekunze]

I'm all for gas=auto. I was actually confused bc I thought it was a duplicate from the simulate flag

[fedekunze]

also on the TxBuilder, the SimulateGas field is confusing, should say instead SimulateAndExecute or something like that

[fedekunze]

The NewTxBuilderFromCLI() function is inconsistent since it uses the --simulate flag which should only trigger the simulation and not the execution

[alessio]

I think EstimateGas sounds better

[fedekunze]

I think EstimateGas sounds better

maybe, but my impression is that it's just estimating the gas for the simulation and not for the execution afterwards

[alessio]

SimulateInOrderToEstimateGasAndExecute would be more accurate indeed :D

[alessio]

Just kidding :) - I'd rather stress that gas will be automatically calculated