#1 Batch updates support patch.

[Federico]

This patch was generated against the latest HEAD
version (I created it from the safejdbc/src directory).
It adds 2 methods to SQL interface, the corresponding
implementations in SQLExecuter and TXSQL and a new
interface BatchUpdateProcessor.

I think the cvs's patch tool made a little mess with
spaces and/or tabs since it seems to have replaced the
entire code, but in fact I only added code at the end
of each modified file, I did not alter existing
funcionality.
I can send you the modification in other way you
prefer. I also have a testcase for the new methods.

I hope you add this to a future release.

[Federico]

Patch against HEAD to add batch updates support