handling small nodes
Small node cutting is implemented. New troubles emreged. But solve
range redundancy first.

N[7<-0#752]@1: #91
N[395<-7#91]@2: #16
N[20982<-395#16]@3: #8
N[40508<-20982#8]@4: #7
N[64018<-40508#7]@5: #5
N[117700<-64018#5]@6: #5
N[500095<-117700#5]@7: #5

20982   2        2                                 2/3
[  0]-@0f.00.00.00/8  00.00.00.00/0  0 : 65535    0 : 65535 0x00/0x00
[565]-@c0.97.0b.4b/32 0f.3d.21.6f/32 0 : 65535    0 : 65535 0x06/0xFF
[569]-@c0.97.0b.4c/32 0f.3d.21.6f/32 0 : 65535 2121 :  2121 0x06/0xFF
[570] @c0.97.0b.4c/32 0f.3d.21.6f/32 0 : 65535 2211 : 65535 0x06/0xFF
[571] @c0.97.0b.4c/32 0f.3d.21.6f/32 0 : 65535 2200 : 65535 0x06/0xFF
[572] @c0.97.0b.4c/32 0f.3d.21.6f/32 0 : 65535    0 : 65535 0x06/0xFF
[605]*@00.00.00.00/0  0f.00.00.00/8  0 : 65535    0 : 65535 0x00/0x00
[750] @c0.97.0a.00/23 00.00.00.00/0  0 : 65535    0 : 65535 0x00/0x00

Necessity of range rendundancy removal:
(gdb) p dump_node_rules(trie_nodes[43976])
              * **    *  ** **  *                    *
[  0] @0f.00.00.00/8  00.00.00.00/0  0 : 65535 0 : 65535 0x00/0x00
[  2] @c0.97.0a.00/23 00.00.00.00/5  0 : 65535 0 : 65535 0x00/0x00
[  3] @c0.97.0a.00/23 08.00.00.00/6  0 : 65535 0 : 65535 0x00/0x00
[  4] @c0.97.0a.00/23 0c.00.00.00/7  0 : 65535 0 : 65535 0x00/0x00
[  5] @c0.97.0a.00/23 0e.00.00.00/8  0 : 65535 0 : 65535 0x00/0x00
[104] @c0.97.0b.1c/32 0f.00.78.0c/32 0 : 65535 0 : 60999 0x06/0xFF
[129] @c0.97.0b.1c/32 0f.00.78.0c/32 0 : 65535 0 : 62239 0x06/0xFF
[130] @c0.97.0b.1c/32 0f.00.78.0c/32 0 : 65535 0 : 62399 0x06/0xFF
[131] @c0.97.0b.1c/32 0f.00.78.0c/32 0 : 65535 0 : 62409 0x06/0xFF
[132] @c0.97.0b.1c/32 0f.00.78.0c/32 0 : 65535 0 : 62499 0x06/0xFF
[133] @c0.97.0b.1c/32 0f.00.78.0c/32 0 : 65535 0 : 62509 0x06/0xFF
[134] @c0.97.0b.1c/32 0f.00.78.0c/32 0 : 65535 0 : 62599 0x06/0xFF
[135] @c0.97.0b.1c/32 0f.00.78.0c/32 0 : 65535 0 : 62609 0x06/0xFF
[136] @c0.97.0b.1c/32 0f.00.78.0c/32 0 : 65535 0 : 62699 0x06/0xFF
[137] @c0.97.0b.1c/32 0f.00.78.0c/32 0 : 65535 0 : 62709 0x06/0xFF
[605] @00.00.00.00/0  0f.00.00.00/8  0 : 65535 0 : 65535 0x00/0x00
[750] @c0.97.0a.00/23 00.00.00.00/0  0 : 65535 0 : 65535 0x00/0x00