refactored histogram making

figures/esubd(i)/hist_esubd(i)_10p_cbam_lo.pdf

figures/esubd(i)/hist_esubd(i)_10p_cbam_mi.pdf

figures/esubd(i)/hist_esubd(i)_10p_policy_mi.pdf

figures/esubd/hist_esubd_cbam_hi.pdf

figures/esubd/hist_esubd_cbam_lo.pdf

figures/esubd/hist_esubd_cbam_mi.pdf

figures/esubd/hist_esubd_policy_hi.pdf

figures/esubd/hist_esubd_policy_lo.pdf

figures/esubd/hist_esubd_policy_mi.pdf

figures/esubm(i)/hist_esubm(i)_10p_cbam_lo.pdf

figures/esubm/hist_esubm_cbam_hi.pdf

figures/esubm/hist_esubm_cbam_lo.pdf

figures/esubm/hist_esubm_cbam_mi.pdf

figures/esubm/hist_esubm_policy_hi.pdf

figures/esubm/hist_esubm_policy_lo.pdf

figures/esubm/hist_esubm_policy_mi.pdf

figures/esubva(j)/hist_esubva(j)_10p_cbam_lo.pdf

figures/esubva(j)/hist_esubva(j)_10p_policy_hi.pdf

figures/esubva(j)/hist_esubva(j)_10p_policy_mi.pdf

figures/esubva/hist_esubva_cbam_hi.pdf