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make arc() accept radians instead of degrees for angles

	this makes the API uniform across all functions taking angle parameters

--- a/api.c

+++ b/api.c

@@ -341,8 +341,8 @@

 	y = luaL_checkinteger(L, 2);

 	a = luaL_checkinteger(L, 3);

 	b = luaL_checkinteger(L, 4);

-	c = luaL_checkinteger(L, 5);

-	d = luaL_checkinteger(L, 6);

+	c = luaL_checknumber(L, 5) * 180.0/PI;

+	d = luaL_checknumber(L, 6) * 180.0/PI;

 	p = canvaspt(x, y);

 	if(!nofill)

 		fillarc(canvas, p, a, b, fill, ZP, c, d);