format:
no   nucleotid    frame    count
1    ATGATCAGA      1        13
..   ..             .        .. 

ATGATCAGA | AATGCTAGA_34 TAGCTAGCT_45 ...
..        . ..           ..

gb115.yeast.introns_EID.12.0.outstat means yeast introns segments of
length 12 in 0th frame. Edges are directed in the network since there is this 
5' - 3' orientation. Thus, .outstat means file which contains the data about 
outgoing edges of respective nodes. The same holds for ingoing edges in 
.instat files.