v3.1.11

• added highly experimental way to close and reopen netlists at runtime
  • known issue: the Python context does not change properly between netlists
• added creation of backups for Python files created within the editor outside of the .hal file
• added user prompt when detecting Python file backups after a crash
• fixed crash when moving top module upward
• fixed module cache inconsistencies causing bad memory allocs in the GUI when deleting nets or endpoints