Move more classes to more specific locations.

Moved .model classes to .base.
Deleted some unused classes.
Moved functional tests into a new .funcitonal package.
Followup to 1450250.

Change-Id: Ic087fe4a014d9179fab3dc6f833aaf73373f9452
diff --git a/src/com/android/documentsui/dirlist/Model.java b/src/com/android/documentsui/dirlist/Model.java
index ed1237a..580e6bc 100644
--- a/src/com/android/documentsui/dirlist/Model.java
+++ b/src/com/android/documentsui/dirlist/Model.java
@@ -17,8 +17,8 @@
 package com.android.documentsui.dirlist;
 
 import static com.android.documentsui.Shared.DEBUG;
-import static com.android.documentsui.model.DocumentInfo.getCursorLong;
-import static com.android.documentsui.model.DocumentInfo.getCursorString;
+import static com.android.documentsui.base.DocumentInfo.getCursorLong;
+import static com.android.documentsui.base.DocumentInfo.getCursorString;
 
 import android.database.Cursor;
 import android.database.MergeCursor;
@@ -33,8 +33,8 @@
 import com.android.documentsui.DirectoryResult;
 import com.android.documentsui.RootCursorWrapper;
 import com.android.documentsui.Shared;
+import com.android.documentsui.base.DocumentInfo;
 import com.android.documentsui.dirlist.MultiSelectManager.Selection;
-import com.android.documentsui.model.DocumentInfo;
 import com.android.documentsui.sorting.SortDimension;
 import com.android.documentsui.sorting.SortModel;