remove "return to basic" option in tablet settings

AndroidManifest.xml

@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.android2.calculator3"
-    android:versionCode="16"
-    android:versionName="1.7"
+    android:versionCode="17"
+    android:versionName="1.7.1"
     android:installLocation="auto">
 
     <uses-sdk android:minSdkVersion="14" android:targetSdkVersion="16"/>

res/layout-sw600dp/preferences.xml

@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
+    <PreferenceCategory>
+        <CheckBoxPreference
+            android:title="@string/graph"
+            android:key="GRAPH"
+            android:defaultValue="@bool/GRAPH" />
+<!--   <CheckBoxPreference
+            android:title="@string/function"
+            android:key="FUNCTION"
+            android:defaultValue="@bool/FUNCTION" /> -->
+        <CheckBoxPreference
+            android:title="@string/hexPanel"
+            android:key="HEX"
+            android:defaultValue="@bool/HEX" />
+        <CheckBoxPreference
+            android:title="@string/basic"
+            android:key="BASIC"
+            android:defaultValue="@bool/BASIC" />
+        <CheckBoxPreference
+            android:title="@string/advanced"
+            android:key="ADVANCED"
+            android:defaultValue="@bool/ADVANCED" />
+        <CheckBoxPreference
+            android:title="@string/matrix"
+            android:key="MATRIX"
+            android:defaultValue="@bool/MATRIX" />
+    </PreferenceCategory>
+</PreferenceScreen>