itaps-parallel Clarification of iMeshP_getNumPartNborsArr

[Jason Kraftcheck]

Does iMeshP_getNumPartNborsArr return the sum of the result of
iMeshP_getNumPartNbors for each part, or the size of the difference of the
union of the results of iMeshP_getPartNbors for each part with the input
list?  For example, if I have three parts arranged such that each neighbors
both other parts and I pass in two of the parts to
iMeshP_getNumPartNborsArr, is the result:
 1) 1 because there is one part not in the input list that is adjacent to
     at least one part in the input list
 2) 4 because each part in the input list has two adjacent parts

- jason