synthetic: allow to specify parameters for each level
synthetic: allow to specify parameters for each level

node:2(memory=56000) l2cache:2(size=22000) pu:2

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