Add new VeriSign Secure Server intermediate certificate. Revise docum…

…entation comments. Re-extract authorities file used by checking utilities.

xml/authorities.pem

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 -----END CERTIFICATE-----
 -----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
 -----BEGIN CERTIFICATE-----
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------END CERTIFICATE-----
------BEGIN CERTIFICATE-----
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------END CERTIFICATE-----
------BEGIN CERTIFICATE-----
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