PITHIA-NRF e-science center second release

This deliverable will be the second release of the PITHIA-NRF e-science center and its corresponding documentation. This release will consider the feedback from the user community following the first release and will include components enhanced and further developed based on this feedback and operation experience. The deliverable will describe the enhancements of the three layers of the architecture, their continuous integration, and the operation of the PITHIA-NRF e-science center and its components on the EGI cloud testbed.