[PATCH] command line options to use external command to compress

Hi.

I added the feature to use external command instead of
python bzip2 or gzip module.

[[[
   add two command line options, --bzip2-cmd and --gzip-cmd
   to svn-backup-dumps.py

   if --bzip2-cmd option is specified, the script use bzip2 command to
   compress the dump stream instead of python bzip2 module.

   if --gzip-cmd option is specified, the script use gzip command to
   compress the dump stream instead of python gzip module.

   * tools/server-side/svn-backup-dumps.py
     (SvnBackupOutputCommand): add new class to launch external command to
                               compress.
     (SvnBackup.__init__): add two member variables, __bzip2_path and
                           __gzip_path to hold command line parameters
     (SvnBackup.create_dump): create instance of SvnBackupOutputCommand
                              when __bzip2_path or __gzip_path is valid
   ]]]

Regards.

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