Removed @access annotations because they don't add value

I believe they come from the time when PHP didn't universally
support the language keywords. phpDocumentor doesn't need the
@access annotations.

src/extensions/DatatypeTrait.php

@@ -11,7 +11,6 @@ trait DatatypeTrait {
      * Data types of CSV data-columns, keyed by the column name. Possible values
      * are string, float, integer, boolean, date. See DatatypeEnum.
      *
-     * @access public
      * @var array
      */
     public $data_types = [];
@@ -20,8 +19,6 @@ trait DatatypeTrait {
      * Check data type for one column.
      * Check for most commonly data type for one column.
      *
-     * @access private
-     *
      * @param  array $datatypes
      *
      * @return string|false
@@ -48,8 +45,6 @@ trait DatatypeTrait {
      *
      * Requires PHP >= 5.5
      *
-     * @access public
-     *
      * @uses   DatatypeEnum::getValidTypeFromSample
      *
      * @return array|bool
@@ -81,8 +76,6 @@ trait DatatypeTrait {
      *
      * Requires PHP >= 5.5
      *
-     * @access public
-     *
      * @uses   DatatypeEnum::getValidTypeFromSample
      *
      * @return bool