Fixing attributes to allow &default in tables/sets to be associated

with the field.

This works now:

    type X: record {
        a: table[string] of bool &default=table( ["foo"] = T );
        b: table[string] of bool &default=table();
        c: set[string] &default=set("A", "B", "C");
        d: set[string] &default=set();
    };

I think previously the intend was to associate &default with the
table/set (i.e., define the default value for non-existing indices).
However, that was already not working: the error checking was
reporting type mismatches. So, this shouldn't break anything and make
things more consistent.

src/Type.h

@@ -361,7 +361,7 @@ protected:
 
 class TypeDecl {
 public:
-	TypeDecl(BroType* t, const char* i, attr_list* attrs = 0);
+	TypeDecl(BroType* t, const char* i, attr_list* attrs = 0, bool in_record = false);
 	~TypeDecl();
 
 	const Attr* FindAttr(attr_tag a) const