Paired Data Functions

function	description
zpdRetrieve	Primary function to retrieve paired data
zpdStore	Primary function to store paired data
zstructPdNew	Creates a new paired data struct for retrieving a paired data set
zstructPdNewDoubles	Creates a new paired data struct with data for storing a paired data double data set.
zstructPdNewFloats	Creates a new paired data struct with data for storing a paired data float data set.