Rename vec_access() and vec_size() methods

This commit renames the `vec_access()` and `vec_size()` methods to match
the ones in the `DenseVector` facade class, that is `operator[]()` and
`size()`.

Closes #3

dune/common/densevector.hh

@@ -284,18 +284,18 @@ namespace Dune {
     //! random access
     value_type & operator[] (size_type i)
     {
-      return asImp().vec_access(i);
+      return asImp()[i];
     }
 
     const value_type & operator[] (size_type i) const
     {
-      return asImp().vec_access(i);
+      return asImp()[i];
     }
 
     //! size method
     size_type size() const
     {
-      return asImp().vec_size();
+      return asImp().size();
     }
 
     //! Iterator class for sequential access

dune/common/dynvector.hh

@@ -137,9 +137,9 @@ namespace Dune {
     }
 
     //==== make this thing a vector
-    size_type vec_size() const { return _data.size(); }
-    K & vec_access(size_type i) { return _data[i]; }
-    const K & vec_access(size_type i) const { return _data[i]; }
+    size_type size() const { return _data.size(); }
+    K & operator[](size_type i) { return _data[i]; }
+    const K & operator[](size_type i) const { return _data[i]; }
   };
 
   /** \brief Read a DynamicVector from an input stream

dune/common/fvector.hh

@@ -158,12 +158,10 @@ namespace Dune {
     }
     using Base::operator=;
 
-    DUNE_CONSTEXPR size_type size () const { return vec_size(); }
-
     // make this thing a vector
-    DUNE_CONSTEXPR size_type vec_size () const { return SIZE; }
-    K & vec_access(size_type i) { return _data[i]; }
-    const K & vec_access(size_type i) const { return _data[i]; }
+    DUNE_CONSTEXPR size_type size () const { return SIZE; }
+    K & operator[](size_type i) { return _data[i]; }
+    const K & operator[](size_type i) const { return _data[i]; }
   private:
     void fill(const K& t)
     {
@@ -266,17 +264,15 @@ namespace Dune {
       return *this;
     }
 
-    DUNE_CONSTEXPR size_type size () const { return vec_size(); }
-
     //===== forward methods to container
-    DUNE_CONSTEXPR size_type vec_size () const { return 1; }
-    K & vec_access(size_type i)
+    DUNE_CONSTEXPR size_type size () const { return 1; }
+    K & operator[](size_type i)
     {
       DUNE_UNUSED_PARAMETER(i);
       assert(i == 0);
       return _data;
     }
-    const K & vec_access(size_type i) const
+    const K & operator[](size_type i) const
     {
       DUNE_UNUSED_PARAMETER(i);
       assert(i == 0);