Update to sparse sandbox

better error msg.

Mixed

Now test correctly what should not work as the functionality was implemented by PL.

Mixed

fix clear_unversioned. When there is no key file, we should use the comp...

Install documentation for CentOS

Better inplace scan3

If you try to call __str__ before compiling the function the destroy_map
attribute might not exist.

The optimization before was all or nothing, which is a bad compromise for
scan. This new optimization tries to work in place on each outputs, and
keeps only those for which it can. This way you do not get your entire op to
be non-inplace because of a single output that can not be computed inplace.

Fixes to CentOS instructions, etc.

https://github.com/nouiz/Theano/commit/fcca361f341a18f972a0513ece7c09cc85b858ea#commitcomment-1246687
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