update on recursive clustering

Whats different in the code:

• Cluster class, reorganized the code, now captures the points in each cluster
• changed for multidimension (hopefully)
• few more shortcuts in code
• clusters until root n (initial tests of "while y decreases" turned out bad)

Cluster:
[96, 5]
[88, 17]
[93, 24]
[63, 49]
[93, 52]
[97, 54]
Cluster: 
[71, 55]
[71, 57]
[93, 64]
[88, 68]
[92, 74]
Cluster:
[94, 2]
[83, 14]
[78, 14]
[62, 21]
[62, 34]
[59, 39]
Cluster:
[51, 34]
[51, 35]
[37, 28]
[30, 10]
[19, 26]
Cluster:
[18, 95]
[18, 85]
[32, 84]
[34, 64]
[41, 71]
[45, 55]
Cluster:
[61, 76]
[63, 75]
[70, 82]
[82, 88]
[82, 83]
Cluster:
[1, 20]
[2, 33]
[0, 37]
[2, 39]
[5, 41]
Cluster:
[19, 46]
[9, 49]
[7, 57]
[1, 61]
[1, 63]