Netlist changes:
- Reworked the analog storage model to better support the compiler. 
  This will most likely only pay off on larger matrices than currently used.
  Investment for future platforms with larger vectors
- Added parameter "GS_THRESHOLD" to select the minimum matrix size for Gauss-Seidel solver
- pstate: pointer will be resolved late, i.e. after all initialization is finished.
  State is registered during start, but some pointers are only set during post_load in the solver.