Fix bug #3145, "Memory corruption in imap_disconnect_all"
Fix bug #3146, "Memory corruption when deleting a message from folder"
Reference msginfo before passing to the mark_as_read_timeout deferred
callback.
Fix bug #3147, "verify_folderlist_xml() leaks memory"
Fix bug #3148, "Logic error in claws_get_socket_name()"
Fix bug #3150, "etpan_certificate_check() leaks memory"
Fix bug #3116, "invalid DTSTART in ics subscription makes claws crash"
Fix bug #313, "Crash on reccurent events with no DTSTART"
Fix recognition of quoted parameter values, which are legal.
Fix bug #3117, "full-day event shown from 01:00 to 01:00 next day"
Fix bug #3139, "Mainwindow unresponsive due to a busy loop"
In case of unexpected return from gnutls_record_recv(), set errno to
a fatal error.
Fix bug #3105, "vCal plugin via https does not check SSL peer certificates or host"
Add a preference to disable SSL certificate verification.