DECIMAL-POINT IS COMMA does not reach a COPYed copybook: its VALUE 1,5 is recorded as 1 #3942

Left over from #3911 (fixed in #3940).

_cobol_records reads decimal_comma from the file's own SPECIAL-NAMES. A copybook has none: DECIMAL-POINT IS COMMA belongs to the program that COPYs it, and the compiler applies it to the whole compilation unit. So a copybook member's VALUE 12345,67 is still recorded as 12345 even when every program that includes it declares a decimal comma.

Fix direction: resolve the decimal comma per compilation unit, the way #3935 resolves a copybook's code page from its program. Where a copybook's facts are read on behalf of a program (record layouts, galaxy_ir copy_members), apply that program's decimal_comma. If programs with different settings share one copybook, say which one wins, or record the conflict.

Test: a decimal-comma program that COPYs a copybook with 05 X PIC 9(5)V99 VALUE 12345,67. records the copybook item's value as 12345,67. The same copybook COPYed into a program without the clause keeps 12345. A VALUE 1, 2, 3 list still splits.

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