Bugfix function get_upload_rates of script vis_streaming_files_simple_multiple_mountpoints.py, consider that CloudFusion clears its statistics after a certain amount of files have been written to it
Modify script vis_streaming_files_simple_multiple_mountpoints.py
    Add graph displaying cache size over time
Modify script test_streaming_files_simple_multiple_mountpoints.py, to distribute files into multiple subdirectories instead of a single directory