Move Kaoz/clients to this Git project and change a few things

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>
Add comments in PAM configuration

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>
shell/ircpipe: no longer use temporary file

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>
Add Git hook scripts

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>
Restructure
git hook: don't use 'git config hooks.ircchannel' to find IRC channel

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>
Update README

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>