New Shard-Query features checked into SVN

I checked some updates to Shard-Query into SVN.

Partitioning support has been extended for MySQL 5.6+ to ALL partitioning types.

This includes all previously unsupported types including RANGE LIST/COLUMNS partitioned tables that are partitioned over more than one column, and HASH/KEY/LINEAR variants as well. Shard-Query now exclusively uses the PARTITION hint for partition elimination instead of WHERE clauses in MySQL 5.6. For 5.5 and previous versions, support remains limited to LIST,RANGE, and LIST/RANGE COLUMNS over a single column.

The old mysql interface DAL has been replaced completely by the PDO DAL.

There is no major difference for end users except that you have to check that the return of the query() method is an object with the is_object() function instead of checking that it is a resource with the is_resource() function. I updated bin/run_query, which is the example application.

I made a few bug fixes to the PDO DAL as well.  Thanks again to Alex Hurd for contributing the PDO DAL.