Make apply_issue.py much more verbose about what it's doing.

patch.py

Index: patch.py
diff --git a/patch.py b/patch.py
index 9083094e834dac7f3cd8fce4bb33669389f65048..cd594f8e485055a14b0e7963d13c621245301706 100644
--- a/patch.py
+++ b/patch.py
@@ -100,6 +100,10 @@ class FilePatchBase(object):
       out += '%s->' % self.source_filename_utf8
     return out + self.filename_utf8
 
+  def dump(self):
+    """Dumps itself in a verbose way to help diagnosing."""
+    return str(self)
+
 
 class FilePatchDelete(FilePatchBase):
   """Deletes a file."""
@@ -123,6 +127,9 @@ class FilePatchBinary(FilePatchBase):
   def get(self):
     return self.data
 
+  def __str__(self):
+    return str(super(FilePatchBinary, self)) + ' %d bytes' % len(self.data)
+
 
 class Hunk(object):
   """Parsed hunk data container."""
@@ -491,6 +498,10 @@ class FilePatchDiff(FilePatchBase):
       # We're done.
       return
 
+  def dump(self):
+    """Dumps itself in a verbose way to help diagnosing."""
+    return str(self) + '\n' + self.get(True)
+
 
 class PatchSet(object):
   """A list of FilePatch* objects."""