bash: If TERM is xterm, upgrade to xterm-256color

bashrc

@@ -53,6 +53,11 @@ if [ -z "$debian_chroot" ] && [ -r /etc/debian_chroot ]; then
     debian_chroot=$(cat /etc/debian_chroot)
 fi
 
+if [ "$TERM" == "xterm" ] ; then
+  # Upgrade; I don't think I use anything which doesn't support 256 colour these days.
+  export TERM=xterm-256color
+fi
+
 # If this is an xterm set the title to user@host:dir
 case "$TERM" in
 xterm*|rxvt*)