Don't delete the progid key when unregistering coclasses - this is now 
done in unregister_progids.

This allows writing multiple progids that refer to one class.
Support writing out Version and VersionIndependentProgId keys for classes.

Update LsaQueryInformationPolicy to use correct computer name and SID.
Add support for PolicyDnsDomainInformation.

- Correctly handle the msidbComponentAttributesOptional component attribute.
- Don't set a component's state to INSTALLSTATE_LOCAL if the
  msidbComponentAttributesSourceOnly attribute is provided.

Add tests for SetWindowLong error cases.

ole32: Remove a check on the share mode for the NULL filename case as the check is already done earlier in StgCreateDocfile.

Apparently some copy protection stuff relies on that.
This reverts commit 50fca716.