Expressions reboot

- Created A3.{h,cpp} which will be a simpler, lightweight version of
  Arguments.{h,cpp} that does less, but does it better.
- Created E9.{h,cpp} which will be a better implementation of
  Expression.{h,cpp} that does less, but does it better.
- Integrated A3 into Context::initialize, and Arguments and A3 will
  coexist until A3 surpasses Arguments.

src/Expression.cpp

@@ -60,7 +60,7 @@ bool Expression::evalFilter (const Task& task)
 
   if (!_prepared)
   {
-    _args.dump ("Expression::evalFilter");
+//    _args.dump ("Expression::evalFilter");
 
     expand_sequence ();
     implicit_and ();
@@ -93,7 +93,7 @@ std::string Expression::evalExpression (const Task& task)
 
   if (!_prepared)
   {
-    _args.dump ("Expression::evalExpression");
+//    _args.dump ("Expression::evalExpression");
 
 //    expand_sequence ();
 //    implicit_and ();
@@ -567,7 +567,7 @@ void Expression::expand_sequence ()
   }
 
   _args.swap (temp);
-  _args.dump ("Expression::expand_sequence");
+//  _args.dump ("Expression::expand_sequence");
 }
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -595,7 +595,7 @@ void Expression::expand_tokens ()
   if (delta)
   {
     _args.swap (temp);
-    _args.dump ("Expression::expand_tokens");
+//    _args.dump ("Expression::expand_tokens");
   }
 }
 
@@ -694,7 +694,7 @@ void Expression::implicit_and ()
   if (delta)
   {
     _args.swap (temp);
-    _args.dump ("Expression::implicit_and");
+//    _args.dump ("Expression::implicit_and");
   }
 }
 
@@ -728,7 +728,7 @@ void Expression::expand_tag ()
   if (delta)
   {
     _args.swap (temp);
-    _args.dump ("Expression::expand_tag");
+//    _args.dump ("Expression::expand_tag");
   }
 }
 
@@ -760,7 +760,7 @@ void Expression::expand_pattern ()
   if (delta)
   {
     _args.swap (temp);
-    _args.dump ("Expression::expand_pattern");
+//    _args.dump ("Expression::expand_pattern");
   }
 }
 
@@ -807,7 +807,7 @@ void Expression::expand_attr ()
   if (delta)
   {
     _args.swap (temp);
-    _args.dump ("Expression::expand_attr");
+//    _args.dump ("Expression::expand_attr");
   }
 }
 
@@ -933,7 +933,7 @@ void Expression::expand_attmod ()
   if (delta)
   {
     _args.swap (temp);
-    _args.dump ("Expression::expand_attmod");
+//    _args.dump ("Expression::expand_attmod");
   }
 }
 
@@ -963,7 +963,7 @@ void Expression::expand_word ()
   if (delta)
   {
     _args.swap (temp);
-    _args.dump ("Expression::expand_word");
+//    _args.dump ("Expression::expand_word");
   }
 }
 
@@ -1063,7 +1063,7 @@ void Expression::postfix ()
   }
 
   _args.swap (temp);
-  _args.dump ("Expression::toPostfix");
+//  _args.dump ("Expression::toPostfix");
 }
 
 ////////////////////////////////////////////////////////////////////////////////