An external tokenizer inserts extra spaces to mark words in the input text.
The text is sent through STDIN and STDOUT file handles.

A good choice for Chinese and Japanese is MeCab.
http://sourceforge.net/projects/mecab/
With the command line 'mecab -O wakati'

p_purge_metadata now updates the metadata cache and the INFO array like the other metadata writing functions

this is mainly for use with plugin:upgrade and thus will be
cherrypicked into the current stable branch as well.

make custom buttons possible with html_btn() without the need of global $lang (more consistent with tpl_pagelink())