Added support for optional flat-list display of "All Books"

Files modified:

config_default.php

base.php

changed class PageAllBooks to test for configuration option "cops_titles_split_first_letter".
Used getCurrentOption to prepare for making Split Letter options configurable in web GUI

book.php

added SQL_BOOKS_ALL query to have a flat-list datasource not grouped by first letter.
added const SQL_BOOKS_ALL to class Book
added public static function "getBooks", called from Base::PageAllBooks to retrieve the flat-list

config_default.php

@@ -137,6 +137,13 @@
      * 0 : No
      */
     $config['cops_author_split_first_letter'] = "1";  
+
+    /*
+     * split titles by first letter
+     * 1 : Yes
+     * 0 : No
+     */
+    $config['cops_titles_split_first_letter'] = "1";  
     
     /*
      * Enable the Lightboxes (for popups)