fix jenkins backup if some directories don't exist #27
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the main bug fix here is commit 1c0508e which checks if directories exist before attempting to copy their contents into the archive directory.
commit fb1f419 cleans up some of the temporary files and directories, to not leave so much stuff around after the backup script exists.
commit c1ed1ab makes the TMP_TAR_NAME variable contain an absolute pathname which simplifies it's use.
and finally commit c65ef6f suggests to use the -delete argument for the find command, instead of the "xargs rm" anachronism.