Remove kpp command

This commit removes kpp command and all its reference it some
old code path that is not used any more.

kpp is now superseded by rocks list node xml
Removing kroll

This commit removes kroll and all its' rerefences
kroll command is now superseded by rocks run roll.
Remove cfgen

This patch remove cfgen command from rocks
This command is not supported anymore
devel: remove outdated developers guide hidden in old folder

Inside src/devel/src/roll/doc there was a very outdated developers
guide. The new current developers guide is in src/developersguide.
usersdoc: restored appendix/base-nodes.sgml

This file in the usersdoc was outdated and out of sync.
It is now automatically generated at built time
with kdoc.

Some of the nodes.xml file had an incorrect XML header
that was causing problem with kdoc
pylib: remove even more unneeded python modules

This commit also kills cluster-kill