* src/dialog-cell-format.c: Reactivated the 'Coloring' page
in struct array cell_format_pages.

* src/dialog-cell-format.c (create_coloring_page): Lots of
changes, practically a full rewrite. One problem is that cells
are thrown into this world with the flag STYLE_FORE_COLOR of
their style set, which causes a lack of synchronization with
what is expressed in the global variable foreground_radio_list.

* src/dialog-cell-format.c (apply_coloring_format): By the moment
being, deactivated the call of function cell_set_pattern, along
with the STYLE_PATTERN bit flag of style->valid_flags. I will
concentrate in fg/bg coloring of the cell.