ENH: changed definition of complex::one (#1247)

- was historically defined as (1 1), but it is more consistent with
  the concept of one to have a real component only.

  Now defined as (1 0):  1+0i

STYLE: remove obscure '!' operator for complex conjugate

- either use the member function or the '~' operator

applications/test/complex/Test-complex.C

@@ -56,11 +56,10 @@ int main(int argc, char *argv[])
         << "complexVector::one  : " << complexVector::one << nl
         << nl;
 
-    // Comparison
-
-    for (complex c :  { complex{1, 0}, complex{1, 2}} )
+    for (complex c : { complex{1, 0}, complex{1, 2}} )
     {
         print1(c);
+
         // TDB: allow implicit construct from scalar?
         //
         // if (c == 1.0)