Basic POM changes.
Move all the YAML resource files.
Update YAML IT to find new test resources where Maven puts them.
Move the YamlTester itself out of the Postgres package.
But keep the YamlTesterIT there; the alternative driver (embedded) isn't quite up to running it, yet.
Get rid of case-name option, which duplicates override option.
But make sure that case-names are actually complete and not just the trailing filename.
merge MMcM: Put YAML IT source into a separate module

Merge pull request #1545 from MMcM/sql-layer/test-yaml-jar
https://github.com/FoundationDB/sql-layer/pull/1545
Improve error handling for parse errors in embedded JDBC.
Break out a base class for the embedded JDBC IT.
That is enough to switch IndexScanUnboundedMixedOrderDT.
Adjust REST error reporting to extract embedded JDBC failures a little more consistently.