fix del_privacy_lists odbc query
wrong number of arguments did not give correct error
Always call erl_ddll:format_error on driver load failure

erl_ddll:load_driver usually returns a cryptic error code such
{open_error,-10}.  It's necessary to call erl_ddll:format_error to get
the actual error message, which will usually be rather precise and point
out the problem.
Merge pull request #184 from lixen/command_error

wrong number of arguments did not give correct error
Merge pull request #187 from legoscia/driver-load-errors

Always call erl_ddll:format_error on driver load failure
Merge pull request #186 from esl/fix-remove-privacy-list-odbc

fix del_privacy_lists odbc query