Dynare++: drop remaining "using namespace std"

dynare++/integ/cc/quadrature.hh

dynare++/integ/cc/quasi_mcarlo.hh

dynare++/integ/cc/smolyak.hh

dynare++/integ/src/quadrature-points.cc

dynare++/integ/testing/tests.cc

dynare++/kord/decision_rule.cc

dynare++/kord/decision_rule.hh

dynare++/kord/journal.cc

dynare++/kord/journal.hh

dynare++/src/dynare3.cc

dynare++/src/dynare3.hh

dynare++/src/main.cc

dynare++/tl/cc/equivalence.cc

dynare++/tl/cc/equivalence.hh

dynare++/tl/cc/fine_container.hh

dynare++/tl/cc/int_sequence.cc

dynare++/tl/cc/int_sequence.hh

dynare++/tl/cc/kron_prod.cc

dynare++/tl/cc/permutation.cc

dynare++/tl/cc/permutation.hh