Confirm delete_site_option() exists before calling it during an update.

This function won't yet exist when updating from 2.7 [sic].

fixes #25682 for trunk.

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Always escape URLs at the last possible moment.

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Add editimage.min.js to $_old_files. see #24999.

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Maintain the same output for get_avatar() as 3.6. see [25895].

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Bundled themes: bump version numbers (ignoring Twenty Ten).
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Update POT files for Twenty Ten through Twenty Thirteen.

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Twenty Thirteen: Restore the original "Not found" string. see #24891, for trunk.

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Translator comments are special, make sure they are parsed properly. see #25256.

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POT update.

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