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fplot: add modulus % operator

--- a/sys/man/1/fplot

+++ b/sys/man/1/fplot

@@ -29,7 +29,7 @@

 .LR "xmin:xmax ymin:ymax".

 .PP

 Each function to be plotted may be a combination of the independent variable x, 

-the elementary operations (+, -, *, and /), and the functions described in

+the elementary operations (+, -, *, / and %), and the functions described in

 .IR sin (2)

 and

 .IR exp (2).

--- a/sys/src/cmd/fplot.c

+++ b/sys/src/cmd/fplot.c

@@ -49,6 +49,7 @@

 void sub(void) { sp--; *sp -= *(sp+1); }

 void mul(void) { sp--; *sp *= *(sp+1); }

 void div(void) { sp--; *sp /= *(sp+1); }

+void mod(void) { sp--; *sp = fmod(*sp, *(sp+1)); }

 void pot(void) { sp--; *sp = pow(*sp, *(sp+1)); }

 void osin(void) { *sp = sin(*sp); }

 void ocos(void) { *sp = cos(*sp); }

@@ -72,6 +73,7 @@

 	"-",	OBINARY,	0,	0,	sub,

 	"*",	OBINARY,	0,	100,	mul,

 	"/",	OBINARY,	0,	100,	div,

+	"%",	OBINARY,	0,	100,	mod,

 	"^",	OBINARY,	1,	200,	pot,

 	"sin",	OUNARY,		0,	50,	osin,

 	"cos",	OUNARY,		0,	50,	ocos,