Code deduplication/tidying

- Move default pagination/sort/search query variable mapping to pagination_head.php
- Remove user_logs.php

pagination_head.php

@@ -0,0 +1,40 @@
+<?php
+/*
+ * Pagination - Head
+ * Sets the paging/sort for use in limit/order by
+ * Sets the default search query from GET to $q
+ *
+ * Should not be accessed directly, but called from other pages
+ */
+
+// Paging
+if(isset($_GET['p'])){
+  $p = intval($_GET['p']);
+  $record_from = (($p)-1)*$_SESSION['records_per_page'];
+  $record_to = $_SESSION['records_per_page'];
+}else{
+  $record_from = 0;
+  $record_to = $_SESSION['records_per_page'];
+  $p = 1;
+}
+
+// Order
+if(isset($_GET['o'])){
+  if($_GET['o'] == 'ASC'){
+    $o = "ASC";
+    $disp = "DESC";
+  }else{
+    $o = "DESC";
+    $disp = "ASC";
+  }
+}else{
+  $o = "ASC";
+  $disp = "DESC";
+}
+
+// Search
+if(isset($_GET['q'])){
+  $q = mysqli_real_escape_string($mysqli,$_GET['q']);
+}else{
+  $q = "";
+}