Added  test with 2 SUM clauses with INTO vars.
Added  test with 2 SUM clauses with INTO vars.

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