Merge branch 'origin/master'
BugFix: loader uses combined library now, that has no ready "signal"
add loader that uses the single files, useful for debugging
BugFix: really use the dataset index in URL and make sure there are no "gaps"
Merge branch 'master'
BugFix: wrong string length of suffix for "local"
filter datasets via URL
add JSON URL loading
Merge branch 'DataLoadingUI'
add an example JSON dataset