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**  reductionTesting2D
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** 	Code written by Rahul Jain.
** 	If you have any questions regarding this code, please email me at jain10@illinois.edu
**
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This program tests the section reduction functionality for array sections in Charm++ and smp.


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**
** How to run this program
**
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The program takes in three parameters, in the following order:
arrayDimesionX, arrayDimensionY and vectorSize respectively.

arrayDimesionX -- x dimension of the 2D chare array.
arrayDimesionY -- y dimension of the 2D chare array.
vectorSize -- Each element of the 2D chare array, has a vector of doubles over which reduction is performed.
			  This variable defines the size of the vector. Each vector element is initialized to its index value.
pgm  -- executable

So, for example, if you want to create a 20x10 chare array with a vector size of 5, you could do the following:
	%./charmrun +n4 +ppn8 ./pgm 20 10 5





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Here's a control flow of this program:

Input from user(arrayDimensions X and Y, vectorSize)
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				V
Create an 2D chare array (Test2D) of the given dimension.
Each chare element has a vector of size vectorSize, each element of which is 
initialized to it's (the element's) index.
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				V
Create an array of Section Proxies. 
//Random things that I decided, in order create the section proxies.
Number of array section proxies that will be created = max(arrayDimesionX, arrayDimensionY) = N.
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Each section proxy does a Multicast (calls Test2D::compute(msg)).
A message is sent to the compute entry, which essentially helps to identify which sectoion Proxy 
are we dealing with, on the receiving end. 
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The compute entry, essentially reduces the vector elements and callbacks to Main::reportSum.