Add several methods to ProfilingManager

[micaeljtoliveira]

Tentative list of missing functions that could be useful when performing profiling studies:

• list_experiments: returns a list of experiments, with some basic information (e.g., status, workdir) The same effect can be achieved by using the __repr__ method of the different objects (see Add __repr__ methods to ProfilingManager and ProfilingExperiment. #41)
• delete_experiment: delete a given experiment
• parse_load_balancing_data: parses data from a load-balancing study (that's a study where CPU cores are divided among tasks in different ways)