Display the number of items currently marked for submission

[whym]

When I go through items, I sometimes unintentionally leave things marked - I may forget turning off items marked by default, or I may fail to click precisely when I try to unmark a large group that I have marked. If the number of marked item is displayed somewhere prominently (a hovering box on the upper right corner, for example), that will help me correcting mistakes before submitting.

[arthurpsmith]

Hi @whym this is a good suggestion; I've been reluctant to add more javascript-dependent features like this but it's probably time to start looking into this sort of thing seriously. Thanks for the idea!