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-Working on getting CC working: almost there, something is wrong with the encoding of the CC.
-Doesn't yet work for inline replies.
-No cc is displayed when viewing the message.
-Needs some way to control visibility of messages for CCed recipients.
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-Fixed the errors in with encoding in check_for_groups().
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-CC'ed users are now displayed on a mail that is viewed (if a CC exists).
-Adjusted the styling slightly for mail viewing.
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-Added ability to add CC from inline reply.
-CCs are no longer displaying in the view message console -> needs fix.
-Threads should be filtered a little better based on visibility.
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-Code cleanup + adding some TODO notes.
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-Added a fix so that CCed recipients now show up for threaded mail.
-Added more language strings to handle CC.
Merge branch 'MailCC' into MailMerge

Conflicts:
	blocks/course_message/version.php