[Scip] Using knapsack constraint in standalone solver

[Daniel Jensen]

Well, in answer to "why don't you," I'd never heard of CIP before, and I 
can't find any documentation about it anywhere. I'm not all that great 
with C, but as far as I can tell the search for the proper way to 
specify a knapsack constraint in CIP ends with cons_knapsack.c line 8206:

#define consParseKnapsack NULL

:(

As one might therefore expect, replacing "linear" with "knapsack" in a 
CIP file which SCIP has written results in a crash when you try to read 
the file.