exception handling for pycuda regarding memory allocation gpu, squared grid calculation and unused thread rejection, logger info, plot and validation functionality, default model set for sim.

templated driver for states and expos,ps range set in xml,memory set for >states,exceptions,func sig adapt

Update on my side

TVB-2538: Enhance Branch simulation use-case

TVB-2538: working on allowing conn selector in simulation tab in case of branch to show only conn with number_of_regions equal to that of the main one + small fix