Add a task to calculate a trm fingerprint.
* examples/trm.py (added):
Add an example.
Strangely enough it starts burstily, doing 10% directly, halting,
then progressing quickly,
* morituri/image/toc.py:
* morituri/common/checksum.py (added):
* morituri/common/crc.py (deleted):
Rename crc to checksum, because AccurateRip checksums are not CRC's.