fixed endless SOC iteration for HEVs

[kylecarow]

@jhoshiko @jakeholden

I've fixed the issue with endless SOC iteration that we were seeing in https://github.nrel.gov/MBAP/fastsim/issues/423.

The issue was that when starting a new iteration, only the ending SOC -> starting SOC carryover was plumbed up correctly. The actual iteration counter was getting reset each iteration as it is stored within the Vehicle object.

This PR does not fix the issues with those specific vehicles not converging to a balanced SOC!

[kylecarow]

Worth noting too that the default maximum iterations in fastsim-3 is 5, which is decreased from the fastsim-2 maximum of 30(!!!)

@jakeholden Should we change this limit back?

[kylecarow]

@jhoshiko the error for > 5 iterations seems like its pretty vague, let me know if the message you see should be changed :)

fastsim/fastsim-core/src/simdrive/mod.rs

Lines 176 to 204 in e05cacf

	if self
	.veh
	.hev()
	.with_context(|| format_dbg!())?
	.soc_bal_iters
	.get_fresh(|| format_dbg!())?
	> &self
	.veh
	.hev()
	.with_context(|| format_dbg!())?
	.sim_params
	.soc_balance_iter_err
	{
	bail!(
	"{}",
	format_dbg!((
	self.veh
	.hev()
	.with_context(|| format_dbg!())?
	.soc_bal_iters
	.clone(),
	self.veh
	.hev()
	.with_context(|| format_dbg!())?
	.sim_params
	.soc_balance_iter_err
	))
	);
	}

[kylecarow]

@jhoshiko can this be merged?

[jhoshiko]

I'd Say So!