[Orgmode] outline-agenda sorting consistency

[Samuel Wales]

Here are some possible ways that the outline and the agenda
could be made slightly more consistent.  Hope I didn't miss
any that already exist.

  1) priority faces are settable in the agenda.  perhaps
     they could be so in the outline also.
  2) sorting strategy is settable in the agenda.  perhaps it
     could be settable in the outline also.  they could
     share code.

     also:

     * priorities are sortable.  perhaps tags can be
       sortable via a default (built-in) sorting strategy
       also.

       to set the weights, the user configures as follows.
       nil means that tag sorting does nothing.

       ;;urgent gets sorted highest (or lowest, depending on
       ;;perspective).  this is very useful for people who
       ;;have some ordered tags.
       (setq org-tag-sort-weights
             '(("urgent" . 1000)
               ("now" . 100)
               ;;below no tag
               ("someday" . -100))

               ;;nutrition is more important than entertainment
               ("nutrition" . 100)
               ("entertainment" . -100))
     * todo states are sortable.  perhaps they can be
       sortable in such a way that the user can put blank
       entries (no todo state) as desired (e.g. between TODO
       and DONE).  perhaps a variable to set the weights.

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