Imports simulation results that are generated using the external executable

 USAGE:

       [vmcmesh vmcmedium vmcboundary options solution]  ...
       = importValoMC(problemdefinition_filename, solution_filename)

 DESCRIPTION:

       Used to load results from simulations ran using the external executable of ValoMC

 INPUT:

       problemdefinition_filename    - name of the file that contains the problem definition
       solution_filename             - name of the output file from the external executable

 OUTPUT:

       vmcmesh                       - mesh structure, contains the geometry of the system
       vmcmedium                     - medium structure, used to set e. g. optical coefficients
       vmcboundary                   - boundary structure, used to set e. g. light sources

 EXAMPLE:

       exportValoMC('problem_in.txt',vmcmesh, vmcmedium, vmcboundary, vmcoptions);
       ... exit matlab run the simulation ....
       MC2D problem_in.txt problem_out.txt
       ... return to matlab ...
       [vmcmesh vmcmedium vmcboundary options solution] = importValoMC('problem_in.txt', 'problem_out.txt')

 SEE ALSO:

       https://inverselight.github.io/ValoMC/structures.html

 This function is provided with ValoMC