move +stringByDecodingMIMEWordsInString from EDTextFieldCoder into EDHeaderFieldCoder so we are able to use it in -[EDEntityFieldCoder _takeValueFromString:]
not sure what dateWithMessageTimeSpecification: does but dateFormat = @"EEE, dd MMM yyyy HH:mm:ss +0000" seems to do the trick
Add from, to, cc, bcc, attachments and attachmentFilename
fix warning
remove + (void)fprintf:(NSFileHandle *)fileHandle:(NSString *)format, ... because it gets a compiler warning
(isa != ((EDObjectPair *)otherObject)->isa) is deprecated