Added several conversion funcions, plus minor updates

Added several conversion functions:

    Added builtin functions to convert between degrees and
    degrees, minutes and seconds under the config("mod")
    round rules:

	d2dms(degs, d, m, s [,rnd]) - given degs, compute d, m, s
	d2dm(degs, d, m [,rnd]) - given degs, compute d, m

	See help/d2dms and help/d2dm.

    Example:

	; print d2dms(360.321,deg=,min=,sec=), deg, min, sec;
	0.321 0 19 15.6

	; print d2dm(360.321,deg=,min=), deg, min;
	0.321 0 19.26

    Added builtin functions to convert between gradians and
    gradians, minutes and seconds under the config("mod")
    round rules:

	g2gms(grads, g, m, s [,rnd]) - given grads, compute g, m, s
	g2gm(grads, g, m [,rnd]) - given grads, compute g, m

	See help/g2gms and help/g2gm.

    Example:

	; print g2gms(400.321,grad=,min=,sec=), grad, min, sec;
	0.321 0 19 15.6

	; print g2gm(400.321,grad=,min=), grad, min;
	0.321 0 19.26

    Added builtin functions to convert between hours and
    hours, minutes and seconds under the config("mod")
    round rules:

	h2hms(hours, h, m, s [,rnd]) - given hours, compute h, m, s
	h2hm(hours, h, m [,rnd]) - given hours, compute h, m

	See help/h2hms and help/h2hm.

    Example:

	; print h2hms(24.321,hour=,min=,sec=), hour, min, sec;
	0.321 0 19 15.6

	; print h2hm(24.321,hour=,min=), hour, min;
	0.321 0 19.26

In addtion:

    Renumbered regression tests 3408 thru 3437, to 9102 thru 9131.

    Updated Added hms.cal resource file to use h2hms() builtin.
    Updated Added dms.cal resource file to use d2dms() builtin.

    Fix minor typo in help/mod SYNOPSIS.
    Fix minor typo in help/quo SYNOPSIS.

    Added a few more examples to help/strcmp.

zmath.h

@@ -648,6 +648,7 @@ EXTERN HALF _tenval_[], _elevenval_[], _twelveval_[], _thirteenval_[];
 EXTERN HALF _fourteenval_[], _fifteenval_[];
 EXTERN HALF _sqbaseval_[];
 EXTERN HALF _fourthbaseval_[];
+EXTERN HALF _threesixtyval_[], _fourhundredval_[], _twentyfourval_[];
 
 EXTERN ZVALUE zconst[];		/* ZVALUE integers from 0 thru 15 */