8FUNCTIONS: indco - CYANA function

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

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

For instance, for an ambiguous distance restraint with three
assignments, the 'indco' function will return 3 for the first
assignment, -1 for the second assignment, and -2 for the third
assignment. For unambiuously assigned distance restraints, the function
retuns 1.
