Bug 739705 - The mail composer's attachments "toolbar" should have uniform spacing/padding
EMsgComposer - Don't insert unnecessary new line into body, when forwarding an iCal event

Also don't format the body text as bold.
EHTMLEditorView - Fix logic that prevents the text blocks when processing the content into the composer

End block if the current line has less than 62 characters and the
length of the first word on the next line (if presented) plus the
length of the current line is less than 72 characters (that means that
the line was wrapped as there was not enough space left for that word).
Also end block if the line has more than 72 characters.
Bug 739675 - Runtime warnings when forwarding an event

Correctly unsubscribe the callbacks from headers table.