Substitutions PDF for new data model

created branch 215-substitutions-pdf-for-new-data-model to address this issue

mentioned in merge request !315 (merged)

changed milestone to /AlekSIS%"[NLnet #1 (closed)] Implement intelligent substitution planning"

added source::customer::kath label

added part::frontend label

closed with merge request !315 (merged)

mentioned in commit 3211fca8