Improved the hierarchy definition. Implemented mapper.

The parameters for setting the hierarchy moded to the end
of the parameter list for (Typed)HotList.
Function set_parent changed to set_relation.
Implemented a simple mapper that maps the path/event to a function.
Described step05
Ignoring .swp files
An example of a view.

step06 is a copy of step05 with an example of a view, in wxPython
markdown - h2 are underlined with -----