Port to C++11 auto keyword

src/ComputingTasks.cc

src/ConfigFile.cc

src/DataTree.cc

src/DataTree.hh

src/DynamicModel.cc

src/DynamicModel.hh

src/ExprNode.cc

src/ExternalFunctionsTable.hh

src/ModFile.cc

src/ModelTree.cc

src/NumericalConstants.cc

src/NumericalInitialization.cc

src/ParsingDriver.cc

src/Shocks.cc

src/Statement.cc

src/StaticModel.cc

src/SteadyStateModel.cc

src/SymbolList.cc

src/SymbolTable.cc

src/SymbolTable.hh