Implement the setup method that initialize nodes and edges for Newton
Raphson system.
Add the Math.net library to use the factorization LU and QR.
Renamed the location to Math.net library and create a project for
learning tests on this library.
Add learning tests for the Math.net: try to define a matrix, a vector
and solve a system and check if Equals is overridden.
Create the project to hold the system solver code for gas context.
Move again the present code for Netwon Raphson system, attaching to it a
more meaningful namespace.
Move the code for the node class into its dedicated file.
Move the code for edge class and edge builder class into their dedicated
files.
Refactor a little the code for the node, removing an useless property.
Introduce a test class for testing the creation of nodes for Newton
Raphson context.
Write a test to check if getting a computational vector generated from a
single supply node it will return a vector of exactly one item.
Finish to write the first tests for nodes in Netwon Raphson context.