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Fix SVG insertBefore/insertAfter when using <a> wrapper node.

When an element has an "href" the node is wrapped with an <a>.
insertBefore/insertAfter did not take this into account (#631).
Additionally, remove, toFront and toBack now use the new function.
Merge pull request #808 from TheCloudlessSky/svg-parentNode-fixes

Fix SVG insertBefore/insertAfter when wrapped in <a> when setting "href"