Add support for local aur databases

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`.

plugins/archlinux/archlinux.plugin.zsh

@@ -21,10 +21,14 @@ if [[ -x `which yaourt` ]]; then
   alias yalst='yaourt -Qe'         # List installed packages, even those installed from AUR (they're tagged as "local")
   alias yaorph='yaourt -Qtd'       # Remove orphans using yaourt
   # Additional yaourt alias examples
-  if [[ -x `which abs` ]]; then
+  if [[ -x `which abs` && -x `which aur` '']]; then
+    alias yaupd='yaourt -Sy && sudo abs && sudo aur'  # Update and refresh the local package, ABS and AUR databases against repositories
+  elif [[ -x `which abs` ]]; then
     alias yaupd='yaourt -Sy && sudo abs'   # Update and refresh the local package and ABS databases against repositories
+  elif [[ -x `which aur` ]]; then
+    alias yaupd='yaourt -Sy && sudo aur'   # Update and refresh the local package and AUR databases against repositories
   else
-    alias yaupd='yaourt -Sy'               # Update and refresh the local package and ABS databases against repositories
+    alias yaupd='yaourt -Sy'               # Update and refresh the local package database against repositories
   fi
   alias yainsd='yaourt -S --asdeps'        # Install given package(s) as dependencies of another package
   alias yamir='yaourt -Syy'                # Force refresh of all package lists after updating /etc/pacman.d/mirrorlist
@@ -45,10 +49,14 @@ alias pacreps='pacman -Ss'             # Search for package(s) in the repositori
 alias pacloc='pacman -Qi'              # Display information about a given package in the local database
 alias paclocs='pacman -Qs'             # Search for package(s) in the local database
 # Additional pacman alias examples
-if [[ -x `which abs` ]]; then
+if [[ -x `which abs` && -x `which aur` ]]; then
+  alias pacupd='sudo pacman -Sy && sudo abs && sudo aur'  # Update and refresh the local package, ABS and AUR databases against repositories
+elif [[ -x `which abs` ]]; then
   alias pacupd='sudo pacman -Sy && sudo abs'              # Update and refresh the local package and ABS databases against repositories
+elif [[ -x `which aur` ]]; then
+  alias pacupd='sudo pacman -Sy && sudo aur'              # Update and refresh the local package and AUR databases against repositories
 else
-  alias pacupd='sudo pacman -Sy'     # Update and refresh the local package and ABS databases against repositories
+  alias pacupd='sudo pacman -Sy'     # Update and refresh the local package database against repositories
 fi
 alias pacinsd='sudo pacman -S --asdeps'        # Install given package(s) as dependencies of another package
 alias pacmir='sudo pacman -Syy'                # Force refresh of all package lists after updating /etc/pacman.d/mirrorlist