This update fixes a few bugs:
- Improper response to double SIGINT with editline.
- Not letting libedit handle terminal size changes.
- A dc crash from improperly handling an error.
- A duplicate check for reference arrays.
- Build failures with GCC 15.

This is a production release to fix three bugs, none of which
affects well formed scripts on FreeBSD:

The first bug is that bc/dc will exit on macOS when the terminal
is resized.

The second bug is that an array, which should only be a function
parameter, was accepted as part of larger expressions.

The third bug is that the value stack for dc was cleared on any error.
However, this is not how other dc behave. To bring dc more in line
with other implementations, this behavior was changed. This change is
why this version is a new major version.

This update fixes a potential issue when flushing stdout on exit
fails: longjmp could use an uninitialized target address variable.

Most files are included in this commit due to a changed date in
the copyright note.

This update fixes a bug that line breaks in printed numbers may not
match the line length set by the user. The value is printed correctly,
just not split as specified in some situations.

This version adds a command to dc to query whether extended registers
are enabled or not.

This update contains only documentation changes (new main repository
URL and changed mail address of the program author) and changes to
the build system that do not affect the FreeBSD base system build.

This is a production release with a new feature and a few bug fixes.

The bug fixes include:

 - A crash when bc and dc are built using editline, but history is not
   activated.
 - A missing local in the uint*() family of functions in the extended
   math library.
 - A failure to clear the tail call list in dc on error.
 - A crash when attempting to swap characters in command-line history
   when no characters exist.
 - SIGWINCH was activated even when history was not.

The new feature is that stack traces are now given for runtime errors.
In debug mode, the C source file and line of errors are given as well.

Changes relative to the previous version in FreeBSD:

- Fix error message on certain syntax errors.
- Add digit clamping (build option and run-time option)
- Make -l options no longer overridee scale value set with -S

The filter_text function in scripts/functions.sh in version 5.3.3 had
commented out a "rm" command, probably for debugging purposes. This
caused temporary files to persist in /tmp when the bc program had been
built.

This commit fixes the build process with no change of the resulting
artefacts.

This update restores support for suppression of the prompt with -P
when using the libedit or libreadline libraries for command line
editing and history.