PIPS man pages

• wpips X-window user interface for beginners.
• epips X-window/GNU-Emacs user interface.
• tpips a command line user interface for advanced users which may benefit from the tpips script language.
• pips a minimal user interface, improved by the following Shell scripts: Init, Display, Perform, Build, Select, Delete. Most of them are based on the Pips Shell script. They all can be used to write larger Shell scripts as well as beginner interface. However wpips is the best interface to explore PIPS functionalities.