Put kochi-ttf back for now. Although this could be obsoleted by
Sazanami font, some other packages explicitly / implicitly depend
on kochi-ttf yet.
And, the license problem was gone long ago. No reason to hurry
now.
This release is a stop-gap of Kochi TrueType font and composed of real free
fonts.
It was revealed that older Kochi fonts were (unfortunately) based on an illegal
free font. Older Kochi fonts must not be distributed any more.