[MERGE] Tree.print_file and Repository.print_file are deprecated.

[Alexander Belchenko]

This patch contains 2 revisions:

  3342 Alexander Belchenko       2008-04-07
       `bzr cat` no more internally used Tree.print_file().

  3343 Alexander Belchenko       2008-04-07
       Tree.print_file and Repository.print_file are deprecated.


First change reworks behavior of 'cat' command. This change will help my eol work.

Second change is just logical step afterward: print_file is not used by bzrlib itself
and want to print directly to sys.stdout. It's not very good from various POV.
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