Restructure recorded_data folder

[Nanoseb]

For now all the logs are in the same folder, which lead to 1300 files in one place. The filenames not starting with the timestamp but their content (like param-dump) is not helping the sorting.
To improve that I thought about having a folder per launch with the name: 2018-08-28T12.41.55-calshot-triangular-race
And then in it:

• rosbag.bag
• param-dump.json
• gps-raw-nmea
• gps-trace.csv
• map-gps-trace.html
• rosbag.bag.metadata

When/If we changes this file structure it will lead to adapting the launch files that stores bags etc. as well as the index_recorded_data.py script that generates the html page and .metadata.

[takluyver]

The index was designed to alleviate this a bit, but I agree that it would make sense to arrange the files into folders as well.

[Nanoseb]

Also having this kind of folder structure means that we can have a script that easily in one command: run roscore, load the parameter dump, play the rosbag and launch the 2D visualisation for example. Which is tedious at the moment because each file has a different name structure.

[Nanoseb]

What needs to be edited:

• path/filename in script/debugging_dump_params
• path/filename in script/debugging_gps_log
• path/filename in launchfile.launch (rosbag record line)
• path/filename in script/sensor_driver_gps for raw-nmea file

One of the difficult aspect here is to have a consistent timestamp that is propagated and used by all the files (=how to set a parameter with the timestamp of the beginning of the launch)

And also:

• index_recorded_data.py file handling

• write a one time script to convert the old file structure to the new one (part of index_recorded_data.py can be reused to associate file belonging to the same mission together)

[smaria]

IIRC there is no easy way of making rosbag record append a postfix rather than using a prefix. For Delphin2 I ended up using a bash script for launching, which recorded the start time and then handled all the naming at the end.