now that we require Java1.7

This reverts commit ae6da320, reversing
changes made to 8b018f2b.

* Custom data types handler

* Updated doc, changelog, dictionary. Fixed review comment.

* Extended the custom types handler interface

* Fixed test

* Fixed review comments

* Added note on ABI stability of the feature to docs

System.currentTimeMillis() is influenced by system time corrections
whereas System.nanoTime() is strongly sequential. So it is better to use
System.nanoTime() when checking for timeouts and elapsed time.

Added new BITGET function, that returns true if and only if a specified bit in a long is set. This helps simulate bit fields in H2, which is an approach I'm using to significantly shrink database size.