buildelement.py: Only display one activity message (#507)

This fixes #507 (closed) in the bst-1.2 branch

added 3 commits

• 0a61f341...55aacefa - 2 commits from branch bst-1.2
• 12fea82e - buildelement.py: Only display one activity message (#507 (closed))

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enabled an automatic merge when the pipeline for 12fea82e succeeds

merged

mentioned in commit a4c9e5b2

mentioned in merge request !730 (merged)