[RFC] requiring Perl SVN libraries for git-svn

Are there any git-svn users out there who would be seriously hurt if I
dropped support for using the svn command-line client in git-svn?

The API of the SVN:: libraries seem to be relatively stable these days
and are *much* faster than the command-line client.  I plan on
maintaining compatibility with version 1.1 of the SVN libraries for at
least another year; or more if it's not a big problem.

Lately, I've introduced support for authentication and connecting to
repositories with limited read permissions, as well as reading from the
config files in ~/.subversion; so everything that could be done with
the command-line client backend can be done with the libraries, too.

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