figures: ContrastEstimation used DesignMatrix arrow (dev version)
figures: ContrastEstimation used DesignMatrix arrow (NIDM 0.2.0)
fix: used by entities were displayed instead of generated by
Possibility to have an entity used by multiple activities
fix: DesignMatrix used by ContrastEstimation + generated entities
Merge pull request #223 from cmaumet/con_est_used_design_matrix

Specification: DesignMatrix should be used by ContrastEstimation