Author: Moritz Lenz <mor...@faui2k3.org>
Date: 2011-03-10 (Thu, 10 Mar 2011)
[S29] reworked external command execution
after discussions with Tene++ and Juerd++ I am convinced that it is best
to separate run() and shell(), where the former roughly corresponds to
p5s system(LIST), and the latter to system(SHELL_EXPR).
Also removed some outdated note, and added conjecture about :$cwd