Regression: some questions aren't answered properly, as they used to.

[martinodb]

I removed the funciton g-rephrase-from-tree, which was an eyesore, but now I have to reimplement some functionality it did. Most things work, but who-questions with more than one answer no longer work. Also having problems with questions of type "is it true that..". I rushed to merge the change into development and even master. Oh, well.

The last fully working (ie, non-regressive) commit is: 738c20c

UPDATE: almost fixed. Only questions starting with "doesn't" give errors.