* src/widgets/modest-header-view-render.c:

* src/widgets/modest-header-view-render.c:
        * (get_pixbuf_for_flag): now it also supports getting specific
          icons for high and low priorities.
        * Removed get_pixbuf_for_compact_flag,
          _modest_header_view_header_cell_data,
          _modest_header_view_compact_date_cell_data,  as it's not
          required in the new header view.
        * Modified the compact view for header view. Now it uses the
          new hbox and vbox cell renderers. Modified also to have
          specific cell renderers for the attachment and priority
          icons. Here we fill the new cell renderers using the model.
* Added src/widgets/modest-hbox-cell-renderer.c:
        * New cell renderer that let's developer embed cell renderers
          in an horizontal layout. Supports specific expanded cell
          renderers.
* Added src/widgets/modest-vbox-cell-renderer.c:
        * New cell renderer that let's developer embed cell renderers
          in an vertical layout. Supports specific expanded cell
          renderers.
* src/widgets/modest-header-view.c:
        * Now cmp_rows is only used for comparing flag columns.
        * Reworked all the sorting code, to use tree model column id's.
        * Modified the compact view for header view. Now it uses the
          new hbox and vbox cell renderers. Modified also to have
          specific cell renderers for the attachment and priority
          icons. Here we construct the cell renderers.
* src/modest-init.c:
        * Removed the old layout cells for compact view.
* src/maemo/modest-platform.c:
        * Reworked the sort dialog to fit with the new sort code
          in header view.

pmo-trunk-r2001