- Update to 2.12.19.0:
  * Added notes to help/unexpected about:
    display() will limit the number of digits printed after decimal point
    %d will format after the decimal point for non-integer numeric values
    %x will format as fractions for non-integer numeric values
    fprintf(fd, "%d\n", huge_value) may need fflush(fd) to finish
  * Fixed Makefile dependencies for the args.h rule.
  * Fixed Makefile cases where echo with -n is used.  On some systems,
    /bin/sh does not use -n, so we must call /bin/echo -n instead
    via the ${ECHON} Makefile variable.
  * Add missing standard tools to sub-Makefiles to make them
    easier to invoke directly.
  * Sort lists of standard tool Makefile variables and remove duplicates.
  * Declare the SHELL at the top of Makefiles.
  * Fixed the depend rule in the custom Makefile.
  * Improved the messages produced by the depend in the Makefiles.
  * Changed the UNUSED define in have_unused.h to be a macro with
    a parameter.  Changed all use of UNUSED in *.c to be UNUSED(x).
  * Removed need for HAVE_UNUSED in building the have_unused.h file.
  * CCBAN is given to ${CC} in order to control if banned.h is in effect.
  * The banned.h attempts to ban the use of certain dangerous functions
    that, if improperly used, could compromise the computational integrity
    if calculations.
  * In the case of calc, we are motivated in part by the desire for calc
    to correctly calculate: even during extremely long calculations.
  * If UNBAN is NOT defined, then calling certain functions
    will result in a call to a non-existent function (link error).

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