
These sources were taken from the Interviews-3.1 OS library.
See Appendix A of the Intervews Reference Manual for a description.

I decided to use this library because it is simple, fast and quite well
written (and also free).

Changes to original Interviews Version:

1. changed suffix from .c to .cc for consistency (optional)

2. found bug in string.cc (reported to Mark Linton, will be fixed in 
   next release of Interviews, the fix is commented with "// allan")
