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Also make all functions local as to not spill variables into the
global namespace.

Signed-off-by: Marc Cornellà <marc.cornella@live.com>

  The command 'which' launches an external process that isn't
  really necessary.

oops

With these simple changes the plugin checks for the local AUR database and updates the aliases so it can update it when you issue a `pacupd` or `yaupd`.

* yaupg now also updates AUR packages
* Add yalst alias : it lists the installed packages, even from AUR
* Add yaorph alias : it removes orphans using yaourt