[Kst] branches/work/kst/hierarchy/kst/src/libkstapp

[Brisset, Nicolas]

I have tested the hierarchy version a bit, and have quite a few
comments. Is it OK if I first send a list of comments to the list, and
then we can decide which ones should go to bugzilla ? Otherwise I'll end
up adding lots of entries...
There is one crash, some tough questions, and usability quibbles (not
all relevant to the changes done by Eli).

Nicolas