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Use 'User-Agent' instead of 'X-Mailer' header when sending message

It is suggested in RFC 5536:
https://tools.ietf.org/html/rfc5536#section-3.2.13

evolution mirror

src/em-format/e-mail-formatter-headers.c		diff \| blob \| blame \| history
src/em-format/e-mail-formatter-quote-headers.c		diff \| blob \| blame \| history
src/libemail-engine/e-mail-folder-utils.c		diff \| blob \| blame \| history
src/libemail-engine/e-mail-session-utils.c		diff \| blob \| blame \| history
src/libemail-engine/mail-ops.c		diff \| blob \| blame \| history
src/mail/e-mail-reader-utils.c		diff \| blob \| blame \| history