#350 TXOle::Clone hides virtual function (regression in 6.34/6.35)

[Vidar Hasfjord]

In the Exception Transport Review [r1770], as part of fixing [bugs:#230], owl::TXBase::Clone was made const on the 6.34 branch. In OCFNext, ocf::TXOle inherits owl::TXBase, but it was not updated, thus rendering its intended override of Clone dysfunctional.

Note that in OWLNext 6.40 and later, this issue does not apply, since TXBase::Clone is not const in these versions. It remains non-const as in the original OWL 5. This is because [r1770] was only applied to the 6.34 branch, and not to 6.40 and later versions.

Proposed solution: Make TXBase::Clone non-const again for 6.36, as in the original OWL 5, and deprecate it and relegate it to OWL5_COMPAT mode (or remove it altogether) on the trunk, where it is no longer used (exception transport is now implemented using std::exception_ptr).

[Vidar Hasfjord]

This issue does not apply to supported version of OWLNext, so I have closed it as "wont-fix".