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Create a MIME-compliant header that can contain many character sets.

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        the string.  In this case, when producing an RFC 2822 compliant
header
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(with
        Base64 or quoted-printable) header strings.  In addition, there is
a
        75-character length limit on any given encoded header field, so
        line-wrapping must be performed, even with double-byte character
sets.

        This method will do its best to convert the string to the correct
        character set used in email, and encode and line wrap it safely
with
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        If the given charset is not known or an error occurs during
        conversion, this function will return the header untouched.

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