More improvements to documents and viewing

Created 'docs' and 'lib' subdirectories.
Docs contains the diagrams and generated drawing files (and TODO).
Lib contains the vim files to pretty display the drawing and diagram files.

Renamed/moved/modified diagram_reader/requirements/dbctl.

Added parse_class script that parses the existing java code and
generates a .ppmd diagram file.

Modified postprompt script to shortcut some of these scripts.