More testings and fixings:

* Test that adding a text file under a name formerly tracked as
  binary (and vice versa) gets the right keyword-substitution
  behavior.
* Explicitly set -kkv for text files to make the tests pass.
* CVS warns in these cases about "changing keyword expansion mode",
  but this is correct behavior, so filter it from stderr. Filter
  stdout the same way in case we ever want to keep any of it.
* In rcs_add(), replace comments with obviousness.

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