checkNearlyEqual(): check against absolute tolerance for values close to zero
checkNearlyEqual(): check against absolute tolerance for values close to zero

Borrows the same logic as from the Quantity.equals()
function

pierrelb/RMG-Py,nyee/RMG-Py,chatelak/RMG-Py,nickvandewiele/RMG-Py,nickvandewiele/RMG-Py,nyee/RMG-Py,pierrelb/RMG-Py,chatelak/RMG-Py