Support more locale-specific formatting options in cash_out().
The POSIX spec defines locale fields for controlling the ordering of the value, sign, and currency symbol in monetary output, but cash_out only supported a small subset of these options. Fully implement p/n_sign_posn, p/n_cs_precedes, and p/n_sep_by_space per spec. Fix up cash_in so that it will accept all these format variants. Also, make sure that thousands_sep is only inserted to the left of the decimal point, as required by spec. Per bug #6144 from Eduard Kracmar and discussion of bug #6277. This patch includes some ideas from Alexander Lakhin's proposed patch, though it is very different in detail.
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