Issue 210 - mtn diff should ignore mtn:manual_merge files (monotone)

Hello,

A new issue has been created:

210 - mtn diff should ignore mtn:manual_merge files
Project: monotone
Status: New
Reported by: Stephen Leake
Labels:
 Type:Incorrect Behavior
 Priority:Medium

Description:

Steps to reproduce the problem:
-------------------------------

1. add a large (50 MB) text file 
2. run mtn diff; notice that it chokes 
3. add mtn:manual_merge to large file
4. run mtn diff

Expected result:
----------------
does not diff the manual_merge file, outputting a message about "has mtn:manual_merge attribute" instead.

Actual results:
---------------
still chokes (hangs, produces no output for a _very_ long time).


Output of `mtn version --full`:
-------------------------------
1.0

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Issue: https://code.monotone.ca/p/monotone/issues/210/