Two patches included:
- the first one enables the use of bool variables in fields which might
become NULL.
  Up to now the lib told you that NULL is not a bool variable, even if
you provide a indicator.

- the second patch checks whether a value is null and issues an error if
no indicator is provided.

Sidenote: IIRC, the variable should be left alone if the value is NULL.
ECPGlib sets it's value to 0 on NULL. Is this a violation of the
standard?

Regards
     Christof