Changing soft fields for Image object

Till now there was an idea to expose full path to image file and thumbnail.
It's quite impossible in certain situations, where path to the media files is
not known. Therefore 'imagepath' was removed due to redundancy with filename
stored in db, and 'thumpath', which now is a simple calculation of the
expected thumbnail relative filepath.

pygtktalog/dbobjects.py

@@ -213,20 +213,13 @@ class Image(Base):
         return img
 
     @property
-    def thumbpath(self):
+    def thumbnail(self):
         """
-        Return full path to thumbnail of this image
+        Return path to thumbnail for this image
         """
         path, fname = os.path.split(self.filename)
         base, ext = os.path.splitext(fname)
-        return os.path.join(self.img_path, path, base + "_t" + ext)
-
-    @property
-    def imagepath(self):
-        """
-        Return full path to image
-        """
-        return os.path.join(self.img_path, self.filename)
+        return os.path.join(path, base + "_t" + ext)
 
     def __repr__(self):
         return "<Image('%s', %s)>" % (str(self.filename), str(self.id))