AUSAM/source/libS/PWB

- All .c files should include "stdio.h" in local directory, not <stdio.h>.
- stdio.h should set NFILE to 15, not 20.
- portli.c: fixed bug with ntof;
  added _ntof FUNCTION to scan for first slot with that FD.
- strcmp, strcat, strcmp, strcpy were moved to libc.a.