8FUNCTIONS: inpk - CYANA function

Synopsis: inpk(<integer>) = <integer>

For the peak assignment with the given index, this function retuns
either the number of assignments of the peak that has the selected
assignment as its first assignment, or, if the selected assignment
is not the first assignment of an ambiguously assigned peak, the
difference between the indices of the first assignment and of the
selected assignment, a negative number.

For instance, for a peak with three ambiguous assignments, the 'inpk'
function will return 3 for the first assignment, -1 for the second
assignment, and -2 for the third assignment. For unambiuously assigned
peaks, the function retuns 1.
