Allow actual 5% difference in heating/cooling fraction load served

[bookwyrm]

When processing an HPXML file with FractionHeatLoadServed value of 0.95 and FractionCoolLoadServed value of 1.0 where the two systems share the same duct system, there is a translation error stating that the two values are not within 5% of each other.

This is likely due to an approximation of floating point values.

I suggest changing the boundary check from 0.05 to 0.051 at https://github.com/NREL/hescore-hpxml/blob/master/hescorehpxml/__init__.py#L1655 in order to allow an actual check of 5% threshold.

[nmerket]

Sounds reasonable to me.