Better organize generated power files

[adelnoureddine]

With the upcoming version 2.0, we will have many files generated (if the user activates all features). JoularJX should organize these files in a better way.

For instance, in a tree hierarchy: results/{app,all}/{runtime,total}/{calltree,methods}

[JeremyNison]

After some discussions with @adelnoureddine , we agreed on the following file hierarchy :

The folders will be created depending on the selected configurations options.