examples: update test files.

Commit 9c718e402f76d7fb8c72d13ee43615e72310d92f fixed some undefined
behaviors, thus slightly changing some of the test files.
Commit 7f95e862 has change intput file format.
This commit restore the input file format set in commit 61d147 (same as the qconvex input file).
Remove vrml2qconvexinput.py that is deprecated since the sch_creator input and qconvex are the same.
Fix README.