Move bash and zsh aliases into a common file and functions to scripts.

Having two sets of aliases is hard to manage, therefore merging bash and
zsh aliases prevents duplicate content.
Some functions set with those aliases needs to be run with sudo and
therefore keeping them as functions does not work. Hence, they have been
moved into scripts located in a new dedicated "bin" folder.
https://serverfault.com/questions/177699/how-can-i-execute-a-bash-function-with-sudo

bin/update_mirrorlist

@@ -0,0 +1,21 @@
+#!/bin/sh
+
+mirror_file="$pacman_dir/mirrorlist"
+mirror_pacnew="$mirror_file.pacnew"
+mirror_orig="$mirror_file.orig"
+mirror_tmp="/tmp/mirrorlist.tmp"
+
+if [ -f "$mirror_pacnew" ]; then
+    echo "Using $mirror_file"
+    mv "$mirror_pacnew" "$mirror_orig"
+fi
+
+if [ ! -f "$mirror_orig" ]; then
+    echo "$mirror_orig: file not found" >&2
+    exit 1
+fi
+
+grep 'Server' "$mirror_orig" | tr -d "#" > "$mirror_tmp"
+rankmirrors -n 6 "$mirror_tmp" > "$mirror_file"
+rm -f "$mirror_tmp"
+pacman -Syy