Fixed renaming issue with +, * and / binary operators…

Occuring when one of the inputs is not a dseries object.

(cherry picked from commit 5ac7ea053a682d8c86ecede0fcdbd1377e92a196)

src/@dseries/mrdivide.m

@@ -30,7 +30,7 @@ if isnumeric(o) && (isscalar(o) ||  isvector(o))
     if ~isdseries(p)
         error('dseries::mrdivide: Second input argument must be a dseries object!')
     end
-    q = dseries(zeros(size(p.data)), p.firstdate);
+    q = copy(p);
     q.data = bsxfun(@rdivide, o, p.data);
     for i=1:vobs(q)
         if isscalar(o)

src/@dseries/mtimes.m

@@ -30,7 +30,7 @@ if isnumeric(o) && (isscalar(o) ||  isvector(o))
     if ~isdseries(p)
         error('dseries::mtimes: Second input argument must be a dseries object!')
     end
-    q = dseries(zeros(size(p.data)), p.firstdate);
+    q = copy(p);
     q.data = bsxfun(@times, o, p.data);
     for i=1:vobs(q)
         if isscalar(o)

src/@dseries/plus.m

@@ -30,7 +30,7 @@ if isnumeric(o) && (isscalar(o) ||  isvector(o))
     if ~isdseries(p)
         error('dseries::plus: Second input argument must be a dseries object!')
     end
-    q = dseries(zeros(size(p.data)), p.firstdate);
+    q = copy(p);
     q.data = bsxfun(@plus, o, p.data);
     for i=1:vobs(q)
         if isscalar(o)