rename of default distance function
add default load calculator settings
extract search_setup_mixins
add kernel_order option
trivial change
add IntervalQuadratureUnit and iter_quadrature_units()
fix bug and add more SetupMixin tools
bug fix
put away quadrature point about SetupMixin settings and redesign SimpAssemblersConsumer
bug fix
add 1d raw model

  (raw model is similar to PhysicalModel in Java version)
add SimpPostProcessor
add patch test for Poisson 1d