Make conversion between same unit a safe no-op#35
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This PR adds a simple check to see if the user is trying to convert a unit to itself.
This can make it easier for code accepting a certain unit to simply convert the unit, as the current implementation throws an error if the unit is the same.
units.MustConvertFloat(1, units.Pascal, units.Pascal)This throws a panic
panic: failed to resolve conversion: no path found, which is fixed by this PR.