MyCyma

[fix] handle image/thumbnail errors better in helpers

[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)

[evol] improved and updated application helpers for new restfull_plugin version

[evol] ArtworkStepImage: added helper method to get a thumbnail by size

[evol] image frame improvements #3 (cleanup)

[evol] image frame improvements #2 (was artwork frame improvements)

[evol] artwork frame improvements #1

[evol] created display_artwork_frame() helper function and now use it in the welcome page + created a set/group tree view with it too

[evol] add complete user management interface

[fix] remove hardcoded submit label in display_standard_form_buttons() helper and propagate submit_label view variable to it