headers: add Delivered-To check
karma: 2 changes:

* apply awards before adding message header (so the Header value has data_post
  awards shown)
* permit karma to rejecting during queue hook
* rename config_data -> cfg (concise, and that's

the convention we're using elsewhere (especially in plugins)
Merge pull request #730 from msimerson/server

rename config_data -> cfg (concise, and that's
Merge pull request #728 from msimerson/headers

headers: add Delivered-To check
Merge pull request #729 from msimerson/karma

karma: 2 changes:
dmarc: new DMARC plugin

uses dmarc_httpd from Mail::DMARC for processing and reporting
connection.js: save A-R header after data_post

so DKIM and DMARC plugins get a chance to update it
spf: store SPF results in ResultStore (was notes)
dmarc: save results in 'results' (was in a note)
dmarc: cleanup rebase litter
dmarc: use new boolean config option
dmarc: add intermediate header in cmd_data, and update

in data_post_respond if new results
dmarc: get DKIM validation from X-Spam-Tests
dmarc: wrap JSON parser in a try

since it may get garbage
dmarc: check for txn before saving results
update to get results from new dkim_verify plugin