added list conversion when using HDF5 for mesh reading
added list conversion when using HDF5 for mesh reading

shikhar413/openmc,johnnyliu27/openmc,johnnyliu27/openmc,kellyrowland/openmc,paulromano/openmc,mit-crpg/openmc,mjlong/openmc,keadyk/openmc_mg_prepush,shenqicang/openmc,mit-crpg/openmc,liangjg/openmc,keadyk/openmc_mg_prepush,wbinventor/openmc,johnnyliu27/openmc,samuelshaner/openmc,mit-crpg/openmc,wbinventor/openmc,smharper/openmc,wbinventor/openmc,kellyrowland/openmc,nhorelik/openmc,amandalund/openmc,walshjon/openmc,johnnyliu27/openmc,shikhar413/openmc,keadyk/openmc_mg_prepush,smharper/openmc,amandalund/openmc,liangjg/openmc,walshjon/openmc,liangjg/openmc,sxds/opemmc,smharper/openmc,shikhar413/openmc,wbinventor/openmc,samuelshaner/openmc,liangjg/openmc,samuelshaner/openmc,nhorelik/openmc,walshjon/openmc,paulromano/openmc,lilulu/openmc,mjlong/openmc,paulromano/openmc,shikhar413/openmc,lilulu/openmc,samuelshaner/openmc,lilulu/openmc,bhermanmit/openmc,sxds/opemmc,bhermanmit/cdash,shenqicang/openmc,paulromano/openmc,smharper/openmc,bhermanmit/openmc,mit-crpg/openmc,amandalund/openmc,amandalund/openmc,walshjon/openmc