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
)

use keyword argument for readability.

Gpu conv faster

bugfix gradient of csm_properties

Minor stuff (including a fix for a bug recently introduced)

Merge feature (rebased)