DbEnv.set_errfile

toku_db_env_err now writes to the file from set_errfile
toku_db_env_err calls toku_db_env_err_vararg

Fixed DbException.set_env, and callers of it.
Modified test1 to not use exceptions, since the test tried to use return codes.

Closes #214
Addresses #197
Addresses #215

git-svn-id: file:///svn/tokudb@1303 c7de825b-a66e-492c-adef-691d508d4ae1