jdbc minor version reported when running Derby on Java 6

[Rick Hillegas]

I'm winding down the work on the remaining bits of JDBC 4.1. I am 
testing a patch which changes the JDBC level reported by Derby's 
drivers. See derby-5488-09-aa-jdbcMinorVersion.diff patch attached to 
DERBY-5488.

After checking in this patch, Derby will report that its JDBC level is 
4.1 if you are running on Java 6 or 7. If you are running on Java 5 or 
1.4, the level will continue to be 3.0.

We could also report that the JDBC level is 4.0 on Java 6. However, I 
lean toward reporting 4.1 as the level on that platform. That is because 
you can still call the new 4.1 methods via reflection when running on 
Java 6.

I'm not adamant about this choice, however. Please speak up now if you 
feel strongly that 4.0 is a better choice when running on Java 6. If you 
are not sure what you think about this topic, please air your 
uncertainty now. I would like to reach consensus sooner rather than 
later. Please don't defer this discussion until we're in the middle of 
vetting a 10.9 RC next spring.

Thanks,
-Rick