MAJOR REFACTORING OF GUTS
If you run Email::MIME, you MUST be running Email::MIME 1.857 or
better.
require Email::MIME 1.857 in Makefile.PL only if an older
version is already installed
boldly moving forward with refactored headers and
Email::Simple:::Header
greatly reduce memory footprint
add crlf method to allow other modules to avoid ->{mycrlf}
fix broken header-junk test