Fixed off by one error that caused problems when resampling within a voxel during uniform sampling.
Details: voxel and uniform sampling both use variables ii, jj, kk to track mesh indices locating the current voxel.  Uniform sampling only used these variables in order to ID which voxel was being used, and ultimately stored the same indice value as value+1.  ii jj kk are now reduced by 1, to align with voxel sampling usage.
Fix Makefile so that mcnp function defs survive.