put back L#/P# prefixes in graphical output
put back L#/P# prefixes in graphical output

This commit was SVN r2868.

shekkbuilder/hwloc,ggouaillardet/hwloc,shekkbuilder/hwloc,ggouaillardet/hwloc,ggouaillardet/hwloc,ggouaillardet/hwloc,shekkbuilder/hwloc,shekkbuilder/hwloc