- closes an exploit whereby an infected online MMGen installation could craft
a special TX file to trick an offline signing MMGen into executing an
arbitrary expression
- update TX file format (to v3) to permit calling literal_eval() on unmodified
inputs and outputs data (old v2 file format continues to be supported)
- new TX file conversion script: `scripts/tx-v2-to-v3.py`
- `scripts/tx-old2new.py` modified and renamed to `scripts/tx-v1-to-v3.py`