Report percentage of progress of a process to database

Allow to report percentage of progress of a process to database. It will let the possibility to have users see what is the progress of analysis being processed when the refresh their cases (by updating GUI).

A possibility would be that module process.py could be modified with calls to server to report progress, either through the main function or through a thread running in parallel and scanning a progress variable, that would submit it at regular intervals to mongo database.