Updates of the LG modules to be consistent with the cubep3m modules.
The three modules are nobody (LG.F90), material (mat_ini_LG.F90),
sourceprops (sourceprops_LG.F90).

Note that the differences between the cubep3m and LG versions are
very minor in extent. We could consider merging the codes and
testing for the type of simulation to do the right thing.
Merge branch 'master' of github.com:garrelt/C2-Ray3Dm

Inconsistency in different versions...