FERN: Fast Explicit Reaction Networks SVNCode

Renamed function to find max flux to maximumFlux and cleaned up.

Added function to find the max value of the flux at each timestep.

Removed unused code

Cleaned up reduction summation for sum X

Added reducedMaxFinder.cu and reducedMinFinder.cu, which illustrate tree algorithms to find max and min of array of number in ln N time.

Added reducedSum.cu, which illustrates using a tree algorithm to sum an array of numbers in ln N time.

Added function Xsummer to sum X for all species. Presently test with serial sum.

Small changes

This version of explicitgpu.cu appears to be giving the same results as the Java code for asymptotic up through a time of 2.2e-10 seconds (250 int steps), assuming in both codes dt = 0.1*t.

This version of explicitgpu.cu appears to be giving the same results as the Java code for asymptotic up through a time of 1.9e-12 seconds, assuming in both codes dt = 0.1*t.