st: serset limits are wimpy

[David Airey <david.airey@vanderbilt.edu>]

I tried to combine 18 .gph graphs each with about 10 series. I ran into 
a limitation of sersets used being greater than 99. Has anyone else had 
this problem or would like to join me in the opinion that limiting the 
number of series in a graph_combine command to 99 is pretty wimpy? I'm 
annoyed.

-Dave

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