[openbeos] Query menu for Mail

Here is my attempt to satisfy, at least in part, Ticket 1208.  I did not
create a button on the toolbar because I don't think drop down buttons
are implemented yet.

http://dev.haiku-os.org/ticket/1208
http://dev.haiku-os.org/attachment/ticket/1208/20070816%20-%20Ticket%
201208.diff

Would any of you mind taking a look and reviewing my code?

To make the query menu actually do something you must create the
"~/mail/queries" directory. After that, you can copy over queries that
are created through tracker's Find feature, but it will hard code the
mime type to be "text/x-email". Since Haiku doesn't put any emails in
the image build, you'll probably want to create a few fake ones.

Thanks,
  Justin

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