Svnwrap

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- Drop support for Python 3.3 (thanks to John Hagen).

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- Add support for Python 3.7 (thanks to John Hagen).

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- Add support for Python 3.6 (thanks to John Hagen).

- Document some overlooked switches::

--no-pager disable the automatic use of a pager
--debug enable debug printing (mainly for maintainer use)
--svn path/to/svn change path to ``svn`` utility (mainly for testing)

- Add ``--ie`` as an abbreviation for ``--ignore-externals``.

- Add ``svn pdiff`` command as a ``patch-compatible`` diff, equivalent to::

svn diff --diff-cmd diff -x -U1000000 --patch-compatible

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- Restore line suppression feature lost during the refactoring of the line
generation logic.

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- Make 'colorama' be a dependency. This is necessary on Windows to support
colorized output.

- Support additional Subversion switches:

--force-interactive
--ignore-properties
--include-externals
--no-diff-added
--patch-compatible
--properties-only
--search
--search-and
--show-inherited-props

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- Avoid DeprecationWarning for using SafeConfigParser in Python 3.2+.

- Avoid filtering stdout and stderr during "svn merge" operations. This ensures
that the output destined for the user's terminal comes out in the desired
order; otherwise, it's possible for Subversion's menu choices to show up
too early (e.g., when choosing the "diff-full" operation, the menu is
redisplayed first followed by the actual diff output, leading to confusion).

- Change to unbuffered method of reading the "svn" client subprocess's output
and error streams to provide realtime output display.

- Display total number of stderr characters instead of repeating all of stderr.