(ft_get_charmaps): Check if the font support iso8859-1

(ft_get_charmaps): Check if the font support iso8859-1
characters.
(fc_weight_table): Add FC_WEIGHT_REGULAR.
(ft_list_family): Check alias.
(ft_list_language): If language is "en", don't try to the second
step.
(ft_default_list): New variable.
(ft_list_default): New function.
(ft_select): If family is not specified, try only the default
fonts.  Treat the weights normal and medium same.
(ft_open): Fix debug message.  If registry is not specified, try
unicode-bmp.  Handle _MULE_BASELINE_OFFSET property of BDF fonts.
(ft_find_metric): Likewise.
(ft_render): Likewise.
(ft_list): Fix debug message.  Accept the registring iso8859-1.
If family is not specified, try only the default fonts.