bitSet: macros and vector storage

use std::vector<uint64> to manage storage.
Make some global variable "constants" into macros.
add swap()

testApp/misc/testBitSet.cpp

@@ -140,6 +140,7 @@ static void testOperators()
     
 
     testDiag("assign");
+    testOk1(b1 != b2);
     b1 = b2;
     testOk1(b1 == b2);
 
@@ -266,7 +267,7 @@ static void testSerialize()
 
 MAIN(testBitSet)
 {
-    testPlan(78);
+    testPlan(79);
     testGetSetClearFlip();
     testOperators();
     testSerialize();