New function: new analytical solutions for laser-generated source

[bencox]

Description

• Write a new k-Wave function that implements the analyical solutions from this paper: https://dx.doi.org/10.1121/10.0003558. There is example code in the Supplementary Information to this paper.

• Write an example that compares k-Wave's kspaceFirstOrder1D function with these new analytical solutions.

[bencox]

Here's some code in which I've compared the new model (the one that needs to be written in k-Wave style) with kSpaceFirstOrder1D. This could potentially become a test or an example.

Backing_effect_kWave_vs_theory.m.zip