Various inout improvements:

- purge @inout from comments in the compiler except for places talking about
   the SIL argument convention.
 - change diagnostics to not refer to @inout
 - Change the astprinter to print InoutType without the @, so it doesn't show
   up in diagnostics or in closure argument types in code completion.
 - Implement type parsing support for the new inout syntax (before we just 
   handled patterns).
 - Switch the last couple of uses in the stdlib (in types) to inout.
 - Various testcase updates (more to come).



Swift SVN r13564

lib/Sema/ConstraintSystem.cpp

@@ -922,7 +922,7 @@ ConstraintSystem::getTypeOfMemberReference(Type baseTy, ValueDecl *value,
     // for 'self' to the type.
     if (!isa<AbstractFunctionDecl>(value) && !isa<EnumElementDecl>(value)) {
       // If self is a struct, properly qualify it based on our base
-      // qualification.  If we have an lvalue coming in, we expect an @inout.
+      // qualification.  If we have an lvalue coming in, we expect an inout.
       if (!selfTy->hasReferenceSemantics() && baseTy->is<LValueType>())
         selfTy = InOutType::get(selfTy);