914 keep download product types

[dstopp]

• Fixes #914
• Were any Django, import pipeline, table_schema, or dictionary files modified? Y
  • Database used: opus3_test_200107
  • All Django tests pass: Y
• Were any JavaScript or CSS files modified? Y
  • JSHINT run on all affected files: Y
  • Tested on Chrome, Firefox, Safari, and iOS: Y (Remember to test all browser sizes)
  • Tested for race conditions (with delayed API calls if applicable): Y

Description of changes: -keep track of unselected product types; pass into the python/django code -the django cart.html template modified to use new item in the dictionary that is the 'checked' state -fixed a bug where the totals in the product type might go to 0 if unselected -removed extra update of cart status after the reset that caused a 'flash' of inaccurate information -changed the call to retrieve cart.html to a getJSON and return reqno w/that getJSON -updated format test -added a new test to check for unselect of product types and counts to be correct

Known problems: no known problems

[rfrenchseti]

• Database used: opus3_test_200107
• All Django tests pass: Y
• JSHINT run on all affected files: Y
• Tested on Chrome, Firefox, Safari, and iOS: Y (Remember to test all browser sizes)
• Tested for race conditions (with delayed API calls if applicable): Y