ShelfTagIndex changes and a new one

I'd like a review of changes to the following from this commit only "shelftag done"
https://github.com/flathat/IS4C/commit/01e15442465da1910077e10c6f980c44604221

fannie/admin/labels/ShelfTagIndex.php
- I changed the search for SuperDept names and added a column showing how many shelftags items there are for each superdept.
- Appended "/shelftags" in "RETAIL barcodes/shelftags" because ours don't use barcodes
- made the PDF page a popup instead of replacing the menu page. I find this easier to use.
- I wanted to name it as in <a target="_sd_14"> so more than one set could be open  but couldn't figure out how.
- The popup has to be closed before another set of labels can be generated.  Wish it wasn't so

fannie/admin/labels/genLabels.php -
no net change

fannie/admin/labels/pdf_layouts/WEFC_No_Barcodes.php is new