Add shift-click selection of multiple analysis checkbox inputs on viewanalyses page

[AndrewPoppe]

On an action=viewanalyses page, I'd like to be able to check one analysis, then hold shift when clicking another analysis and "fill in" all the boxes in-between those two boxes with clicks. This allows for quick selection of many checkboxes.

This is especially useful for situations in which approximately half of analyses must be selected (e.g., to make links to only successful analyses, to delete unsuccessful ones, etc). In that situation, the "select all" button does not help.

Here is a userscript that essentially does what I am describing. It can no doubt be improved.