[PATCH] Fix svncopy to behave more like URL -> URL svn copy

[Bradey Honsinger <br...@gmail.com>]

[[[
Fix svncopy.pl to behave more like URL -> URL svn copy.

Unlike svn copy, svncopy.pl always added the source directory as a
child of the destination, even with a single source, and even if the
destination didn't exist. This change makes svncopy.pl behave like a
URL -> URL svn copy: if called with a single source and the
destination doesn't exist, the source is copied directly to the
destination.

* contrib/client-side/svncopy/svncopy.pl.in
  If we have a single source, copy it directly to the destination
  to avoid creating an extra subdirectory under the destination.

* contrib/client-side/svncopy/svncopy.README
  Update README to show that extra subdirectory is no longer created.
  Fix example that showed svn copy creating an extra subdirectory.

* contrib/client-side/svncopy/testsvncopy.pl.in
  Update tests to reflect new behaviour.

]]]

Given the following repository structure:

$REPOS/
|-- tags/
`-- trunk/
    `-- foo.c

Running "svn copy $REPOS/trunk $REPOS/tags/version_1" results in:

$REPOS/
|-- tags/
|   `-- version_1
|       `-- foo.c
`-- trunk/
    `-- foo.c

However, "svncopy.pl $REPOS/trunk $REPOS/tags/version_1" gave us an
extra "trunk" subdirectory under tags/version_1:

$REPOS/
|-- tags/
|   `-- version_1
|       `-- trunk
|           `-- foo.c
`-- trunk/
    `-- foo.c

svncopy.pl always created the destination directory in the repository
first, then copied the source into it; since the destination directory
already existed, the source directory was added as a child of the
destination. That's the same thing that svn copy would do for multiple
sources or an existing destination, but a single source would be
copied directly to the destination.

This patch special-cases a single source; with multiple sources,
svncopy.pl was already consistent with svn copy.

  - Bradey

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