user visible changes:
    * new instl commands:
        ** create_readlinks, creates .readlink files instead of symlink
        ** resolve_readlinks creates symlinks instead of .readlinks file - currentlu used in copy on Mac OS
    * trans command now reads BASE_REV from config file, has new option --config
    * up2s3 command implemented using aws and writes a batch file like all other commands
    * up2s3 command can be used on a range of versions

    programmer visible changes:
    * new function SVNItem.walk_items_depth_first, and tests for this function
    * platformSpecificHelper_XXX new functions: rmfile, rmdir, not implemented for windows yet
    * variable BASE_REPO_REV default set to 1 for all commands
    * CONFIG_FILE variable instead to S3_CONFIG_FILE and used by all instlAdmin commands
instl 0.6.2 goes live