Remove a few deprecated constructs

The language keeps changing when I'm not looking!

src/exa.rs

@@ -40,7 +40,7 @@ fn exa(opts: &Options) {
     // more than one of them.
     let print_dir_names = opts.dirs.len() > 1;
     
-    for dir_name in opts.dirs.clone().move_iter() {
+    for dir_name in opts.dirs.clone().into_iter() {
         if first {
             first = false;
         }
@@ -128,7 +128,7 @@ fn details_view(options: &Options, columns: &Vec<Column>, files: Vec<&File>) {
         .collect();
 
     if options.header {
-        table.unshift(columns.iter().map(|c| Plain.underline().paint(c.header())).collect());
+        table.insert(0, columns.iter().map(|c| Plain.underline().paint(c.header())).collect());
     }
 
     // Each column needs to have its invisible colour-formatting

src/format.rs

@@ -21,7 +21,7 @@ fn format_bytes(mut amount: f64, kilo: f64, prefixes: &[&str]) -> (String, Strin
     }
 }
 
-#[allow(non_snake_case_functions)]
+#[allow(non_snake_case)]
 pub fn format_IEC_bytes(amount: u64) -> (String, String) {
     format_bytes(amount as f64, 1024.0, IEC_PREFIXES)
 }

src/unix.rs

@@ -76,15 +76,15 @@ impl Unix {
     }
 
     pub fn get_user_name(&self, uid: u32) -> Option<String> {
-        self.user_names.get(&uid).clone()
+        self.user_names[uid].clone()
     }
 
     pub fn get_group_name(&self, gid: u32) -> Option<String> {
-        self.group_names.get(&gid).clone()
+        self.group_names[gid].clone()
     }
 
     pub fn is_group_member(&self, gid: u32) -> bool {
-        *self.groups.get(&gid)
+        self.groups[gid]
     }
 
     pub fn load_user(&mut self, uid: u32) {
@@ -108,7 +108,7 @@ impl Unix {
         // The second call will return None if it's a null pointer.
 
         loop {
-            match unsafe { group.offset(i).to_option().unwrap().to_option() } {
+            match unsafe { group.offset(i).as_ref().unwrap().as_ref() } {
                 Some(username) => {
                     if unsafe { from_c_str(username) } == *uname {
                         return true;