relax SVN archive

Modified the Class_container class to be more like the Uf_container class.

Added two iterator methods for looping over the user functions and classes.

These are class_loop() and uf_loop().

The user function container args variable is now private and modifiable.

It needs to be modifiable so the __init__ method can initialise it.

Clean up of the pipe module (removal of useless imports and syntax fixes).

The pipe module is now imported in the __init__ module to set up the data structures.

The user function data object is now imported into the interpreter.

Fix for the Uf_container.__mod_attr__ list.

Removed a duplicate argument.

Added the desc_short arg to the add_keyarg() user function container method.

This arg is used in RelaxErrors for when incorrect parameter are supplied.

Converted the entire of the 'pipe' module to populate the user function data structure.