[MERGE][RFC] C implementation of PatienceSequenceMatcher

[John Arbash Meinel]

John Arbash Meinel has voted -1.
Status is now: Vetoed
Comment:
I think this is going in a good direction. But the test suite needs to 
be cleaned up to run when the extension module cannot be loaded.
And we need to add some tests for different edge cases that I mentioned 
on the list. (And the C version should pass them).

One other thing I just noticed:

I've been using the form:

try:
   from X_c import foo_c as foo
except ImportError:
   from X_py import foo_py as foo

The reason I do that, is so that in tracebacks, or when debugging, etc 
you can see quite clearly that you are using the C implementation of the 
function. (The __name__ attribute will have 'foo_c' versus 'foo_py' even 
though it is accessed as bzrlib.patiencediff.foo).

I know it seems redundant since the full name is 'bzrlib._bar_c.foo_c' 
but I think it is still useful.

For details, see: 
http://bundlebuggy.aaronbentley.com/request/%3C1185191314.6260.47.camel%40nemo%3E