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implement radians() to convert from degrees to radians

--- a/api.c

+++ b/api.c

@@ -419,6 +419,16 @@

 	return 0;

 }

+int

+cradians(lua_State *L)

+{

+	int a;

+

+	a = luaL_checkinteger(L, 1);

+	lua_pushnumber(L, a*PI/180.0);

+	return 1;

+}

+

 void

 registerfunc(lua_State *L, const char *name, int(*f)(lua_State*))

 {

@@ -457,5 +467,6 @@

 	registerfunc(L, "quad", cquad);

 	registerfunc(L, "transpose", ctranspose);

 	registerfunc(L, "rotate", crotate);

+	registerfunc(L, "radians", cradians);

 }