-- what is the exact use of the DML_OPTIONS environment variable?

* by default the DML_OPTIONS environment variable is not set
* same behavior can be obtained by defining DML_OPTIONS=native
* Integrator delivers natively its own C compiler for generation and compilation of DML. Customer has the possibility to use its own compiler by defining DML_OPTIONS=classic
* debug can be added to help analyze why a send to server is failing by setting DML_OPTIONS=debug but take care send to servers will succeed because errors will not be catched anymore, it doesn't solve issues...
* debug can be mixed with other values by setting DML_OPTIONS=debug,native or DML_OPIONS=debug,classic