Signed-off-by: Zheheng Liu <zheheng.liu@esrf.fr>

This only supports handling them from the single grain reconstruction point of view, but it adds the infrastructure

Signed-off-by: Nicola Vigano <nicola.vigano@esrf.fr>

6D-Twin-cluster creation: fixed a couple of bugs and introduced option to handle shared reflections in a better manner

Signed-off-by: Nicola Vigano <nicola.vigano@esrf.fr>

Signed-off-by: Nicola Vigano <nicola.vigano@esrf.fr>

6D-Twin-reconstruction: fixed selection of twin blobs from parent's shared selection, and matching of the two

Signed-off-by: Nicola Vigano <nicola.vigano@esrf.fr>

This also fixes a bug related to spots not selected in parent but selected
in twin

Signed-off-by: Wolfgang Ludwig <wolfgang.ludwig@esrf.fr>

6D-Reconstruction: updated Cluster/Twins/Extended creation functions to share more code and support multi-detector

Signed-off-by: Nicola Vigano <nicola.vigano@esrf.fr>