Fix infinite loop in Cochrane
Fix infinite loop in Cochrane

https://github.com/jasp-stats/jasp-test-release/issues/1697

Now existing rSources are only considered updated if their content changes.

boutinb/jasp-desktop,boutinb/jasp-desktop,boutinb/jasp-desktop,AlexanderLyNL/jasp-desktop,boutinb/jasp-desktop,AlexanderLyNL/jasp-desktop,boutinb/jasp-desktop,jasp-stats/jasp-desktop,AlexanderLyNL/jasp-desktop,AlexanderLyNL/jasp-desktop,boutinb/jasp-desktop,AlexanderLyNL/jasp-desktop,AlexanderLyNL/jasp-desktop,jasp-stats/jasp-desktop,AlexanderLyNL/jasp-desktop,jasp-stats/jasp-desktop,jasp-stats/jasp-desktop,jasp-stats/jasp-desktop,AlexanderLyNL/jasp-desktop,jasp-stats/jasp-desktop,jasp-stats/jasp-desktop,boutinb/jasp-desktop,jasp-stats/jasp-desktop,boutinb/jasp-desktop