[Ml-yokadi] static method

[Sébastien Renard]

Aurélien,

Why do you use staticmethods in textlistrenderer (added in 9e860ccaf) ? We may 
want to factorise this method in the Task class in db.py  for easy reuse in 
other rendere ? 
In fact we have already one (getKeywordsAsString) which produce a slightly 
different output.

As you may did that for other purpose I won't change it without your opinion 
first ;-)

-- 
Sébastien