This reverts commit eb9d97cc.

Improve trainer function

See merge request !43

Add script to generate masks and masks for databases missing them

Closes #3

See merge request !38

Split trainer engine function into multiple functions in order to re use it in other packages in case of different approaches

[dataset.rst] Add note to dataset.rst specifying the change on the change...

See merge request !41

[doc/results/baselines/lung] Add links to baseline models for lung segmentation

See merge request !42

[conda] To use centos7, we need sysroot (https://conda-forge.org/docs/maintainer/knowledge_base.html#using-centos-7)