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#169996 by Rob Loach global mailhide keys
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#170205 code cleanup
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removing files unnecessary for 4.7
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small bugfix
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#168496 optional tabindex for 4.7
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bug fix for math fallback
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#148079 by Rob Loach. Fall back to math captcha if recaptcha.net unavailable
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#168734 mailhide as separate module and changes for recaptchalib-php-1.9
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#168496 Rob Loach's theme settings ported to 4.7
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#165514 part 2; custom error message