12/19/89 - JR - HISTO.C:
                changed pow10(exp) to pow(10, exp) because there
                seems to be no pow10() on the SUN3
              - UNISTAT.C:
                cast sqrt arg to double -- otherwise gives 0.00 on SUN3
06-29-90 - JR - *.C:
                switched #includes to common.h in order to avoid
                problems when switching compilers
07-02-90 - JR - MULSTAT.C
                changed dcl of err_msg to static because there is no
                auto aggregate initialization on Sun
-------------------------------------------------------------------------------
07/12/90 - JR - histo.c:
                changed 10 to 10.0 in call to pow()
                removed cast to int in truncate_left macro so returns type x
09/05/90 - JR - histo.c:
                changed %f to %lf in printing scale and bin_lb
                in write_histogram();
                restored cast to int in truncate_left macro--so will
                truncate; forced caller to truncate_left to re-cast it
                back to whatever
93/11/30 - JR - unistat.c:
                added else block in calculate_unistat() so that the mean
                and variance are set to BADFLOAT if no. of points = 0