Raised API version because of changes related to #6886

[aafemt]

[AlexPeshkoff]

Dmitry & Vlad! I'm not sure - is it correct reason to change FB_API_VER ?

[aafemt]

I would use it like this:

void ODBCAttachment::detach(Firebird::CheckStatusWrapper* status)
{
    internalDetach(status);
#if FB_API_VER > 40
   release();
#endif
}

#if FB_API_VER > 40
void ODBCAttachment::deprecatedDetach(Firebird::CheckStatusWrapper* status)
{
    internalDetach(status);
}
#endif

[asfernandes]

We can also make cloop generate per-interface #define version, instead of only C++ const.

[AlexPeshkoff]

Generating preprocessor constant together with C++ one seems logical. At least much better than artificial FB_API_VER.