problems:
- names of system call routines may clash with user routines
- some modules in Pascal?
- ttyio, stdio, pasio, unixio
- mention all external references
- list of routines and partitioning
- size of sizes in asz,bcp,dis,new,opn,pac,unp: int or long ?

NOTE:
The run files in mach/*/libpc show the actual usage of this
library.
