fix and enhance ODF::lpOD

Changes for 6.001

• Fix Hnormalize() bug which inserted an extra space
• Hclean_for_cloning() to remove 'rsid' styles from LibreOffice which interfere with cloning.
• Hself_or_parent & Hparent added with with optional $stop_cond to prevent ascending above a specified object type. Removed self_or_parent (without the 'H').
• Hor_cond(cond1, cond2, ...) to combine XML::Twig search conditions