Consolidate profiles in one session

[iparask]

This ticket follows yesterday's discussion about having one analytics session for all profiles that are part of the same executing session from any RCT. For example, an application is executed using EnTK with profiling enabled. This should trigger RP's profiles, which in turn should trigger SAGA profiles.

Furthermore, the analytics session of this application should include all profiles and show the component hierarchy. For instance, when we are doing:

EnTK_prof_session = ra.Session(stype='radical.entk', src='./re.session.0000')

should include all timing from all levels below EnTK.

That should also be true for the frameworks, systems that use EnTK, i.e. HTBAC, RepEx, ICEBERG.