Title: Two-dimensional inviscid, linear Gaussian Pulse 

Description: 
The Gaussian Pulse in Pressure is a widely used test case for fluid flow problems.
An initial pressure disturbance of Gaussian shape results in a pressure wave 
propagating outwards throughout the fluid domain.
An analytical solution exists for the linear inviscid regime.

Reference: Linear Euler analytical solution
The amplitude must be fairly small to still obey the linear Euler equations.
The analytical solution for a certain set of parameters is evaluated in the maple sheet 
inside the 'validate' folder

Restrictions:
The Lattice Boltzmann Method is a scheme with inherent viscosity. 
The parameter omega has to be tuned as far against 2 as possible in order to achieve zero
viscosity as required from assumptions for the analytical solution. 
This however yields artificial oscillations.

Action:
The Gaussian Pulse is run for a set of resolutions and viscosity setttings (omega).
An error norm is calculated.
