[MERGE] rip off the trailing whitespace band-aid

[Marius Kruger]

I forgot to add a highlevel summary in my mail, so heres the NEWS:
      ``bzr selftest`` now fails if the bazaar sources contain trailing
      whitespace, non-unix style line endings and files not ending in a
      newline. About 372 files and 3243 lines with trailing whitespace was
      updated to comply with this. The code already complied with the other
      criteria, but now it is enforced.
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