[fix] handle image/thumbnail errors better in helpers
[fix] ensure ArtworkStep has a non-nil/NULL 'position' (not set in ArtworkStepThumbnail for example)
[evol] added helper methods for ArtworkStep<Image|Thumbnail>
[fix] tries to regen missing thumbnail
[cosmetic] added position number to artwork_step_images, only visible in the admin pages, to be able to change order for steps made the same day (closes #16)
[cosmetic] use first artwork image instead of last for set thumbnail in the tree view (closes #17)
[cosmetic] properly align images vertically in an image list
[cosmetic] display groups in a set into a light blue cell, like in the tree (closes #18), and btw improved CSS handling a bit (unfinished)
[cosmetic] invert arwork list and group list in set view (refs #18)
[cosmetic] improved front view (closes #13)
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