Executable flagging patch

[Aaron Bentley]

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Gustavo Niemeyer wrote:
>>I've merged in the two patches - adjusted to fit with the symlink patch.
>>I didn't take the generate_cset_optimised->generate_changeset part of
>>the change at this point, but all tests are passing.
> 
> 
> Because the "optimization" is killing entry.metadata_change, which
> contains the mode changes, by setting it to None. I have not removed
> it because that "optimization" seems so strange that I must
> be missing something.

The name comes from when it was optimizing by comparing the text ids of
files.  Equivalent functionality is now in ChangesetGenerator.

The tests should not be passing.  If x-bit changes are now supported, we
should test that they are merged properly.

Aaron
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