A few Mesh fixes:

* edge and face extend() methods now add edges and faces in the order given
  by their parameters.  Note that if duplicate edges or faces are specified,
  the order is preserved but the dups are removed, so indices won't match.
* allow extend(), findEdges() and faces.uv to accept lists or tuples
* fix bug in mesh.verts.extend() which didn't correctly check argument types

source/blender/python/api2_2x/doc/Mesh.py

@@ -273,9 +273,9 @@ class MVertSeq:
       l=[(.1,.1,.1),Vector([2,2,.5])]
       me.verts.extend(l)              # add multiple vertices
 
-    @type coords: tuple(s) of floats or vectors
+    @type coords: sequences(s) of floats or vectors
     @param coords: coords can be
-       - a tuple of three floats,
+       - a sequence of three floats,
        - a 3D vector, or
        - a sequence (list or tuple) of either of the above.
     """
@@ -348,12 +348,12 @@ class MEdgeSeq:
       v = me.verts                    # get vertices
       if len(v) >= 6:                 # if there are enough vertices...
         me.edges.extend(v[0],v[1])    #   add a single edge
-        l=[(v[1],v[2],v[3]),(v[0],v[2],v[4],v[5])]
+        l=[(v[1],v[2],v[3]),[v[0],v[2],v[4],v[5]]]
         me.edges.extend(l)            #   add multiple edges
 
-    @type vertseq: tuple(s) of MVerts
+    @type vertseq: sequence(s) of MVerts
     @param vertseq: either two to four MVerts, or sequence (list or tuple) 
-    of tuples each containing two to four MVerts.
+    of sequences each containing two to four MVerts.
     """
 
   def delete(edges):
@@ -520,7 +520,7 @@ class MFaceSeq:
   def extend(vertseq):
     """
     Add one or more faces to the mesh.  Faces which already exist in the 
-    mesh are ignored.  Tuples of two vertices are accepted, but no face
+    mesh are ignored.  Sequences of two vertices are accepted, but no face
     will be created.
 
     Example::
@@ -531,12 +531,12 @@ class MFaceSeq:
       v = me.verts                    # get vertices
       if len(v) >= 6:                 # if there are enough vertices...
         me.faces.extend(v[1],v[2],v[3]) #   add a single edge
-        l=[(v[0],v[1]),(v[0],v[2],v[4],v[5])]
+        l=[(v[0],v[1]),[v[0],v[2],v[4],v[5]]]
         me.faces.extend(l)            #   add another face
 
-    @type vertseq: tuple(s) of MVerts
+    @type vertseq: sequence(s) of MVerts
     @param vertseq: either two to four MVerts, or sequence (list or tuple) 
-    of tuples each containing two to four MVerts.
+    of sequences each containing two to four MVerts.
     """
 
   def delete(deledges, faces):
@@ -706,11 +706,11 @@ class Mesh:
 
   def findEdges(edges):
     """
-    Quickly search for the location of an edge.  
-    @type edges: tuple(s) of ints or MVerts
+    Quickly search for the location of an edges.  
+    @type edges: sequence(s) of ints or MVerts
     @param edges: can be tuples of MVerts or integer indexes (B{note:} will
        not work with PVerts) or a sequence (list or tuple) containing two or
-       more tuples.
+       more sequences.
     @rtype: int, None or list
     @return: if an edge is found, its index is returned; otherwise None is
     returned.  If a sequence of edges is passed, a list is returned.