synchronize "Remove Format" between browsers

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Expected behaviour:

• remove font tags
• remove inline styles
• remove [empty] spans
• work on selection, if there's one; otherwise work on whole document

Observed behaviour:

• IE: only removes font tags from selection; no operation when no selection
• Gecko removes font/span, leaves inline stlye; no operation when no selection
• Safari tends to add new inline styles/font tags with what it thinks is "normal" style (Times New Roman). That's of course the worst case

After update:

IE: unchanged with selection; whole document cleaned without selection Gecko/Safari: Clean selection or whole document

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committed rev [963]