fixed analyzeTopRxns

Now analyzeTopRxns looks at the reactions with the highest expression level not flux. It compares to the signs of the 6 highest fluxes in the jain table. So 0.5 would be 3 out the 6 match. It also outputs the corral value from falcon. 

When running this for 8 highest expression values in 786_O.csv and A498.csv, signMatch stays the same at 0.5 regardless. Corral will change. Is a corral closer to zero better or worse?

Also I made a small change to runFalcon for it to output corral.