skel/.zshrc: Add example for prompt extension for virtualenv
NEWS: Add note about prompt changes in new version
NEWS: Use grml.org address
Add NEWS entry about changed keyboard handling

Signed-off-by: Frank Terbeck <ft@grml.org>
zshrc: Make zle-smkx() and zle-rmkx() more robust wrt changed options

Signed-off-by: Frank Terbeck <ft@grml.org>