Bug Fixes and Minor Enhancements

* Some tables were missing their column headers. Those should all be back.
* Quantities less than 1 being sold will now show on the sales screen, receipt and Invoices screen.
* Returns not done via a return from invoice will now show up under movement history.
* Printing product labels from the Mass Action option will now print more than just the first label.
* The product shelf label has been slightly adjusted, reducing the size of the description font, limiting the manufacturer length, and increasing the barcode text font size.
* Double clicking on the time clock will no longer clock you in and out really fast.
* Printing product labels for products with no price will now work.

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