Fix bug #3094 “OK or Yes to create new directory?”
Fix bug #3138 “pgpinline crashes on signature check if gppme fails to init”
Don't disable rssyl when checking libravatar
Fix build bug.
addrharvest.c:61: error: redefinition of typedef ‘HeaderEntry’
proctypes.h:58: note: previous declaration of ‘HeaderEntry’ was here
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.
Only show error popup first time an error is found.
An error popup is shown if an error is found under init
or first time an error found under scanning. Error popup
is suppressed until restarting claws or a scanning is
performed with success.
Fix bug in string thanks to Mones
Fix hardened builds and typo in configure.ac

Removes:
 • clamav_plugin.c:149:5: error: format not a string literal and
   no format arguments [-Werror=format-security]
 • ./configure: line 20189: dbl: command not found
Factorize SSL things in etpan
Implement certificate chain retrieval and passing. CAs are not loaded
yet.