Add security logger to RedDAV.

Some smaller clean ups whitepsaces and tabs, use PHP_EOL, Doxygen, etc.

boot.php

@@ -51,12 +51,21 @@ define ( 'ZOT_REVISION',            1     );
 
 define ( 'DB_UPDATE_VERSION',       1131  );
 
+/**
+ * Constant with a HTML line break.
+ *
+ * Contains a HTML line break (br) element and a real carriage return with line
+ * feed for the source.
+ * This can be used in HTML and JavaScript where needed a line break.
+ *
+ * @var string
+ */
 define ( 'EOL',                    '<br>' . "\r\n"        );
 define ( 'ATOM_TIME',              'Y-m-d\TH:i:s\Z'       );
 //define ( 'NULL_DATE',              '0000-00-00 00:00:00'  );
 define ( 'TEMPLATE_BUILD_PATH',    'store/[data]/smarty3' );
 
-define ( 'DIRECTORY_MODE_NORMAL',      0x0000);  // This is technically DIRECTORY_MODE_TERTIARY, but it's the default, hence 0x0000
+define ( 'DIRECTORY_MODE_NORMAL',      0x0000); // This is technically DIRECTORY_MODE_TERTIARY, but it's the default, hence 0x0000
 define ( 'DIRECTORY_MODE_PRIMARY',     0x0001);
 define ( 'DIRECTORY_MODE_SECONDARY',   0x0002);
 define ( 'DIRECTORY_MODE_STANDALONE',  0x0100);