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doesn't load the next unread message. thanks to ssu for the initial patch, and neil for the suggestions. r/sr=bienvenu fix for #49305. in "view all headers" mode, we only see the last header for headers where multiple headers are legal. thanks to richard.li@sun.com for the initial patch. r/sr=bienvenu fix for #179803. when we added mail views, we added "Sender is[n't] in addressbook" support to filter / search / views, but it left us with two "Sender" menuitems. this code unifies them into one. on disk (for filters and views) both the old way ("from in ab") and the new way ("from") work, so there isn't a migration issue. r/sr=bienvenu git-svn-id: svn://10.0.0.236/trunk@135107 18797224-902f-48f8-a5cc-f745e15eee43