Added REPORT as an allowed DAV method.
Rework header capitalization code to not touch AS headers
Handle highestmodseq and uidnext untagged responses
Disabled the addition of the "SENT" prefix - this broke IMAP filtering
Encode big parts in quoted-printable

We now encode messages in quoted-printable when content is bigger than
72 bytes.
Disabled encoding to broken entities.
Fix for bug #2549
Fix for bug #2550
Fix for bug #2551
Fix for bug #2553
Fix for bug #2554
Fix for bug #2566
Silented massively annoying log messages.
Fixed include for old gcc versions
Raise exception when not enough memory available
Update ChangeLog
Merge to 2.2.0