Anki add-on: TRUE DUE: no 1000+ limit in deck overview

PROBLEM: The main window caps the number of Due and New cards it shows. For example, whether you have 1,500 or 15,000 Due cards, it will only show the Due number as 1000+. SOLUTION: The true number is shown. CREDIT: The solution was derived mostly from work by Juda Kaleta . Joseph Yasmeh created this add-on to import to Anki 2.1 and to fix a major bug (explained in the code). Also added comments to explain the code. Tested on Anki 2.1.15. No plan to support versions above 2.1.27 because Anki has this feature natively in version 2.1.28. This add-on is an alternative.