data_table: now has CSV write functionality+updated diode range
updated trigate and diode 2d devices

trigate: now simulates first with 0.25 and then with 0.5,
directly jumpging to 0.5 does not converge

diode: using 1.0E-10 as a nonlinear break tol, to have a nicely
converged solution -> good for i/v characteristics
scaling doping and carrier distributions also to cm-3

for postprocessing convenience
fixed copy/paste error: used wrong source quantity for scaled NA
Merge branch 'devel' of github.com:viennamini/viennamini-dev