Improve list-expand-complete-word widget

So it can match our needs.  See
http://www.zsh.org/mla/users/2014/msg00697.html for a discussion about
that.
Update stderred to a better maintained one
Drop clock in RPROMPT
Improve RPROMPT

To check for the existence of dot files or dirs.
Make a more efficient check of dotfiles

So the shell doesn't need to check for the existence of dotfiles
whenever it draws the path.
Improve dotfiles checking with arrays
... still part of the last commit
Improve RPROMPT printing avoiding trialing spaces
Merge branch 'master' of red:/disk/spare/gitroot/pub/dot.zsh
Add psg alias to ps ax | grep
Improve tab command
Do not check for github certificate