too much warnings

• LOTS of "-Wunused-parameter"
• some -Wignored-qualifiers

tools/database/CSVParser.h:120:7: warning: 'const' type qualifier on return type has no effect [-Wignored-qualifiers]
      const std::size_t nbLine() const;

• few -Wmismatched-new-delete

BN/BayesNet_tpl.h:73:5: warning: 'delete' applied to a pointer that was allocated with 'new[]'; did you mean 'delete[]'? [-Wmismatched-new-delete]
    delete (p2);

• few -Winfinite-recursion

tools/database/IDatabaseTable_tpl.h:784:51: warning: all paths through this function will call itself [-Winfinite-recursion]
       const std::vector< std::string >& new_row) {

this is just ubuntu/clang9/-Wall