refactoring of the instruction table; removed unused instructions PUSHTYPTYP and ERROR; new modulo operator %; new examples fibonacci.noja and isprime.noja

examples/fibonacci.noja

@@ -0,0 +1,17 @@
+
+fun fibonacci(n: int) {
+    
+    if n < 0:
+        error("Only non-negative integers allowed");
+
+    if n == 0 or n == 1: 
+        return 1;
+
+    if n == 2: 
+        return 2;
+
+    return fibonacci(n-1)
+         + fibonacci(n-2);
+}
+
+print(fibonacci(10), "\n");