Added tests for the position function that demonstrate failure when end is beyond the end of a proper list.
Added tests for the position function that demonstrate
failure when end is beyond the end of a proper list.

vtomole/SICL,clasp-developers/SICL,vtomole/SICL,clasp-developers/SICL,clasp-developers/SICL,vtomole/SICL,clasp-developers/SICL,vtomole/SICL