Shell aliases: add X Window bell

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>
bin/polyproxy: don't use alias if it doesn't exists (busybox shell)

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>
bin: add new script to find broken symlinks

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>
Dotfiles: add .SciTEUser.properties home file

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