20.0-testing-r2108

• now offering 64 bit binaries for Windows (#435):
  • installer includes 32 and 64 bit nzbget binaries;
  • when updating from older versions the 64 bit binary is installed automatically, although into the old location to keep all your shortcuts intact;
  • using word "windows" instead of "win32" in the setup file name;
• a number of performance optimisations for large download queue with thousands of items (#438):
  • much faster loading of queue from disk greatly improves program start up time;
  • improved queue management for faster download speed;
• automatic update check (#440):
  • new option "UpdateCheck" to check for stable or testing versions (or disable);
  • when a new version is found a notification is shown;
  • the update check is enabled by default for stable versions;
• enabled functional tests on Travis CI (#443);
• better username/password validation when testing connection on settings page (#433);
• improved rar-renamer to better handle certain cases (#442);
• fixed: filter buttons don't work in history (#421, #434);
• fix in functional tests to not rely on sizes of externally generated files (#437);
• fixed: option AuthorizedIP did not work with IPv6 addresses (#439);
• fixed SSL in built-in web-server got broken in the latest testing release (#431);
• fixed: program may hang during update (Linux only) (#445).

NOTE: Due to bug #445 (now fixed) when updating from 20.0-testing-r2075 on Linux the program may hang during restart (all files are already updated at this moment). Use killall nzbget or restart your device to terminate the program.