Scipion-em-relion

- Generated outputParticles
- outputClasses now have rlnEstimatedResolution and rlnPredictedClassScore attributes
- Improved summary using summaryVar and handling when no output
- Added viewer for RelionSelect2DClasses
4.0.13: fix relion-python env for 2D class ranker, requires a specific pytorch version

- remove reading optimiser file during particles import (fix 373)

- fixed the bug calling system python instead of conda env's one in relion class selection protocol

- allow to force assign a single optics group to a multi-group input
- in the protocol Classify2D when defining the output Classes, particles should be assigned with an indirect pointer to avoid problems when running workflows on streaming and unattended.
- in the protocol Extract particles the boxsize validator (positive) prevented the protocol from executing when an inputPointer was used to fill this parameter.
- relion 3.1 removed from the installer
- add missing _pathVars to Plugin class