Retrospective commit from 2009-12-12.
Begin working on faces support. First version of handle_stop_backwards. Rearrange struct bidi_it for more efficient push/pop ops. dispextern.h (struct it): New members prev_stop and base_level_stop. xdisp.c (handle_stop_backwards): New function. (next_element_from_buffer): Handle the situation where we overstepped stop_charpos due to non-linearity of the bidi iteration. Likewise for when we back up beyond the previous stop_charpos. (reseat_1, pop_it, push_it): Set prev_stop and base_level_stop. dispextern.h (BIDI_AT_BASE_LEVEL): New macro. bidi.c (bidi_copy_it): Fix compiler warning due to cast of a pointer to `int'. Don't preserve the first_elt member, as it is no longer copied, because its position in the structure was changed, see below. dispextern.h (struct bidi_it): Move first_elt, new_paragraph, separator_limit, and paragraph_dir to after bidi_stack. Add a note that anything beyond the level stack is not preserved when the bidi iterator state is copied/saved.
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