TL/UCP: add reduce scatter knomial

[Sergei-Lebedev]

What

Add reduce scatter knomial algorithm in TL/UCP

Performance: 8 nodes 64 ppn

msgsize:	knomia us.	ring us.
4	29.45	271.84
8	43.29	792.63
16	53.09	950.44
32	60.85	763.14
64	123.39	883.84
128	531.5	974.35
256	1026.58	1075.77
512	1028.21	1042.87
1024	1942.62	1331.72
2048	2149.71	1287.28
4096	4126.88	2087.69
8192	8338.22	3880.91

8 nodes 1 ppn

msgsize:	knomial us.	ring us.
4	5.47	11.59
8	5.56	14.15
16	4.69	13.96
32	4.83	13.92
64	5.34	14.36
128	5.52	15.37
256	6.16	15.88
512	7.43	19.06
1024	8.14	19.8
2048	9.48	21.71
4096	11.8	25.79
8192	18.59	30.37
16384	26.32	38.85
32768	47.18	58.44
65536	79.68	109.75
131072	130.79	171.54