Dev: Removing row and column .cells() methods

- Now that we have the cells() / cell() methods, with the ability to
  select based on column and row, and the ability to get the whole row
  or column cells, the TD get methods on row / rows / columns were
  redundant and I think should be removed for berevity. It could also
  get confusing with the chaining since there are nested and top level
  methods with the same name.

- Removed:
  - rows().cells()
  - row().cells()
  - columns().cells()

media/src/api/api.columns.js

@@ -42,16 +42,6 @@ _api.register( 'columns().header()', function ( selector, opts ) {
 } );
 
 
-/**
- *
- */
-_api.register( 'columns().cells()', function () {
-	return this.iterator( true, 'column-rows', function ( settings, column, i, j, rows ) {
-		return _pluck_order( settings.aoData, rows, 'anCells', column ) ;
-	} );
-} );
-
-
 /**
  *
  */

media/src/api/api.row.js

@@ -26,16 +26,6 @@ _api.register( 'row().node()', function () {
 } );
 
 
-_api.register( 'row().cells()', function () {
-	var ctx = this.context;
-
-	if ( ctx.length && this.length ) {
-		return ctx[0].aoData[ this[0] ].anCells || undefined;
-	}
-	// return undefined;
-} );
-
-
 _api.register( 'row().data()', function ( data ) {
 	var ctx = this.context;
 

media/src/api/api.rows.js

@@ -43,13 +43,6 @@ _api.register( 'rows().nodes()', function () {
 } );
 
 
-_api.register( 'rows().cells()', function () {
-	return this.iterator( true, 'row', function ( settings, row ) {
-		return settings.aoData[ row ].anCells || undefined;
-	} );
-} );
-
-
 _api.register( 'rows().data()', function ( data ) {
 	return this.iterator( true, 'rows', function ( settings, rows ) {
 		return _pluck_order( settings.aoData, rows, '_aData' );