cslavePI	R function to use external C program cslavePI.
		Copy cslavePI.c in Rmpi library directory to your 
		working directory and compile as "mpicc -o 
		cslavePI cslavePI.c"
masterslavePI 	R script to compute PI=4*\int_0^1 1/(1+x^2) dx.
simPI		Use Monto Carlo simulation to compute PI (with plot). 
                Use simPI to run the program. Use mpi.init.sprng 
		to initialize SPRNG first.
simplePI 	R function to compute PI using slavedaemon.R. 
slave1PI 	R functions to compute PI using slavedaemon.R (load 
		balancing with a server and workers). Use master1PI to 
		run the program.
slave2PI 	R functions to compute PI using slavedaemon.R (load 
		balancing with workers only). Use master2PI to run the 
		program.
