master.c range array structure

The range array passed to coordinator structure looks like this

unsigned int *range_array = {
    2, m(1), 1, m(2), 2,
    2, m(3), 3, m(4), 4,
    2, m(5), 5, m(6), 6
}

For the example of R:[0,9]&[10,15]&[20,27] (unsorted)

unsigned int *range_array = {
    3, m(0), 0, m(1), 1, m(2), 2,
    1, m(10), 10
}

where m(i) is the machine address of vector with id i. Format of array: each subarray contains the following information: Number of vectors in this range, n. The subsequent 2n elements alternate between machine IDs and the vectors we want from that machine. Currently machine ID is an index in the array of machine address strings, which can be a hardcoded array or perhaps distributed hash table.