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implement push() and pop()

	those are convenient helpers that do push (or pop) both matrix and style

--- a/api.c

+++ b/api.c

@@ -507,6 +507,22 @@

 	return 0;

 }

+int

+cpush(lua_State *L)

+{

+	cpushmatrix(L);

+	cpushstyle(L);

+	return 0;

+}

+

+int

+cpop(lua_State *L)

+{

+	cpopmatrix(L);

+	cpopstyle(L);

+	return 0;

+}

+

 void

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

 {

@@ -550,5 +566,7 @@

 	registerfunc(L, "popMatrix", cpopmatrix);

 	registerfunc(L, "pushStyle", cpushstyle);

 	registerfunc(L, "popStyle", cpopstyle);

+	registerfunc(L, "push", cpush);

+	registerfunc(L, "pop", cpop);

 }