Improving mklog [was: Re: RFC Asan instrumentation control]

[Yury Gribov]

> Ultimately, mklog ought to write the ChangeLog itself.
> We get rid of that headache, at least.

How about this then? Updated mklog now adds 'New file'/'New 
test'/'Remove' when necessary.

I did some tests with unified/context-diffed SVN and git and it worked 
as expected. I can do more testing if necessary.

-Y
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