when using Redirect, use the redirecting account's address in the SMTP MAIL FROM
Fix bug #3126 “libravatar: do not collect empty files”

Signed-off-by: Ricardo Mones <ricardo@mones.org>
Update source code references to add git and re-wrap
Update plugins section of manual

• Merge extra plugins section, since they're all provided now.
• Synchronize list of plugins with website list.
• Add new “Obsolete plugins” section for the ones we're not
  shipping anymore for a variety of reasons.
Fix typo
Fix bug #3123, "Clean up git". Patch by Christian Hesse.
Fix bug #3055, "Claws segfaults when cancelling a sticky search
after changing folder"
Probably fix bug #3050, "Claws mail closes when one attempts to delete a tag"
add plugin to display QR-Code for avatar