use a default contructor in VARTYP to evade compiler warning about default copy constuctors
use a default contructor in VARTYP to evade compiler warning about default copy constuctors

exodusdb/exodusdb,exodusdb/exodusdb,exodusdb/exodusdb,exodusdb/exodusdb,exodusdb/exodusdb,exodusdb/exodusdb,exodusdb/exodusdb