NuLib to do list:

for v2.2:
- fix unshk.c to do Type II: nushk.c
- fix NuTest to use thread_crcs if they exist
- CRLF translation in UnSQueeze

for later:
- ShrinkIt compression
- Special APW asm CRC routines (?)

things I'm ignoring:
- create version 2 records
- do something with GS/OS option lists

