File naming convention:
  sS_jJ_dev_YYYY-MM-DD.extension

With:
- S: scenario number.
- J: test number.
- YYYY: year.
- MM: month.
- DD: day.
- dev: client device:
  + and: Android smartphone;
  + fon: Fonera 2.0;
  + iph: iPhone;
  + eee: Asus EeePC 1001-PX.
- extension:
  + agg: OwlPS Aggregator output file;
  + txt: experiment report;
  + log: OwlPS Positioner log file (recorded at the input);
  + out: OwlPS Positioner results;
  + ods: results formatted in a spreadsheet.

If "+coord" is present in a filename before the extention, it means the
real coordinates were added.
For the results, after "+coord", the name of the similarity algorithm
can be added (mean, interval, interval2).