storeZeroes: Helper function that adds zeroes
Description
This function is a helper function that adds zeros to the data structures
that track heat wave information
Usage
storeZeroes(index, potentialHeatwave, hw, hwNumber)
Arguments
potentialHeatwave
Size of the potential heat wave that turned out
not to be a heat wave.
hw
A reference of the vector that contains the heat waves
hwNumber
A reference of the vector that contains the heat wave
numbers.