[histpainter] avoid invalid pointer operations in Luminosity calculations
[histpainter] avoid invalid pointer operations in Luminosity
calculations

Operation like this is not fully legal:

    Double_t arr[20];
    Double_t *ptr = arr-1;
    printf("First arrary element %f\n", ptr[1]);
    
Something like this was used in Luminocity() method. Now fixed
root-mirror/root,karies/root,olifre/root,olifre/root,karies/root,karies/root,olifre/root,root-mirror/root,root-mirror/root,karies/root,olifre/root,karies/root,olifre/root,olifre/root,olifre/root,root-mirror/root,karies/root,root-mirror/root,olifre/root,olifre/root,olifre/root,root-mirror/root,root-mirror/root,karies/root,karies/root,root-mirror/root,karies/root,karies/root,karies/root,root-mirror/root,root-mirror/root,olifre/root,root-mirror/root