Merge branch 'add_CTF' into 'master'

tomwer/core/process/reconstruction/nabu/nabucommon.py

tomwer/core/process/reconstruction/nabu/nabuscores.py

tomwer/core/process/reconstruction/nabu/nabuslices.py

tomwer/core/process/reconstruction/nabu/nabuvolume.py

tomwer/core/process/reconstruction/nabu/utils.py

tomwer/gui/reconstruction/nabu/nabuconfig/ctf.py

tomwer/gui/reconstruction/nabu/nabuconfig/phase.py

tomwer/gui/reconstruction/nabu/test/test_ctf.py

tomwer/gui/reconstruction/test/test_nabu.py

tomwer/resources/gui/illustrations/ctf_z1.png

tomwer/resources/gui/illustrations/ctf_z1.svg

tomwer/test/test_ewoks/test_single_node_execution.py

tomwer/test/test_ewoks/test_workflows.py