hexl: handle large files and I/O errors
* lib-src/hexl.c: Include inttypes.h, for PRIxMAX etc. Do not include ctype.h, as the code no longer uses isdigit. (DEFAULT_GROUPING, un_flag, iso_flag, group_by): Now local to ‘main’. (DEFAULT_BASE, endian): Remove; was not really used. (usage): Remove; now done by ‘main’, as that’s simpler. (progname): Now static. (output_error, hexchar): New functions. (main): Use them. Simplify. Remove "-oct", "-big-endian", and "-little-endian" options, as they did not work and were not used. Use SET_BINARY only on stdin, and fopen with "rb" otherwise. Use SET_BINARY only once on stdout. Do not assume file offsets fit in ‘long’. If an I/O error occurs, report it and exit with nonzero status.
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