Append workouts into one

Problem: You made several activity recordings and want to append each single activity to one concatenated representation.
Background: You can only append activities to each other while you are about to import them. Once they are within the diary, it's not possible anymore to alter them.
Solution: In the import pane, place a checkmark on each entry you want to concatenate. In the lower toolbar, use the Append toolbar button to replace both by a concatenated representation. Each activity will be represented as a lap within the resulting placeholder activity.