* xmlrpc_value_calculate_type() fails for empty arrays
   * PHPDoc for xmlrpc_value_calculate_type()
   * use is_*() instead of gettype() as advised in the PHP manual (and document this)
   * coding style

- Patch #25522 by Cvbge: _db_query() does not return FALSE in case of errors, as stated in documentation.

- Patch #27863 by Robrecht: fixed order of parameters passed to imagecopy().  Could result in black images.

- Patch #24157 by chx/Robin/...: changed file_exists() to is_file() to fix several problems with modules using theimage toolkit.

- Patch #25143 by Robin: use count() instead of is_array() so we don't render code for empty arrays, and such you don't get warnings using PHP5.

- Patch #24141: fix XML UTF-8 bom issue with PHP5.
    Workaround for the fact that PHP5 cannot parse UTF-8 encoded XML feeds
    that start with the so-called "byte order mark".

- Code cleanup: improve format_plural usage, add some missing placeholder/check calls, and introduce API for <link> tags.

  a valid UTF-8 string, beginning and ending on a character boundary.