Merge info.json and summary.json into one

[czisou]

In contrast to other OxWearables packages, asleep produces an "info.json" file for actipy parameters and a "summary.json" file for the sleep-related parameters. I believe these two should be one file.

Also, the --remove_intermediate_files argument deletes "info.json", which I believe is wrong. It is not an intermediate file but an important part of the final output.