#5 base64-encoded subjects patch

[Mike Siomkin]

The base64-encoder implemented in the library inserts line-breaks in every 76 characters. This is ok for attachments. But when subject is encoded line-breaks must not be inserted. This patch eliminates splitting of long base64-encoded subjects into several lines.

[Mike Siomkin]

This patch eliminates splitting of long base64-encoded subjects into several lines