uCON64 Code (SVN)

- Replaced a few more calls to strtol() with calls to strtoll().

- Fixed issue I introduced for --code with the previous submission.

- Renamed --dual to --bit.
- Extended --hex, --bit, --code and --print to also accept an optional end
offset.
- Updated dumper() to also align the ASCII column for --bit and --code.
Slightly simplified the alignment code for --hex.
- Corrected comment generated by --code.
- Changed type of st_ucon64_t.range_start from off_t to int.
- Fixed ucon64_file_handler() for large files (> 2GB) on Windows.
- Fixed potential buffer overflow in ucon64_switches().
- Replaced call to sscanf() for --range with a more elaborate implementation
with better error handling.

- A few more LFS changes.

- More LFS changes.

- Added macro test for byte order that also works on macOS (M1).

- Cast is necessary on 64-bit Cygwin.

- Updated quick_io*() functions to support large file I/O, including on capable
32-bit systems.
- Updated --poke to support a 64-bit offset.
- Modified --hfind and --hfindr to accept search strings without spaces.

- Fixed quick_io_func() to return the correct number of processed bytes in all
three cases for ending the loop. The return value is not used in uCON64.

- Removed redundant/incorrect assignments to errno.
- Fixed signed/unsigned mismatch.