Remove extra/irrelevant test case
merge nathanlws: Remove extra/irrelevant spatial DDL test case

Merge pull request #1459 from nathanlws/sql-layer/remove-extra-spatial-test
https://github.com/FoundationDB/sql-layer/pull/1459
Added table of error code classes
Get correct row count
Updated expectations on test
merge ScottDugas: Added table of error code classes

Merge pull request #1460 from ScottDugas/sql-layer/error-code-categories-table
https://github.com/FoundationDB/sql-layer/pull/1460
Use explicit column names in unparser tests
merge nathanlws: Use explicit column names in unparser tests

Merge pull request #1461 from FoundationDB/sql-layer/tweak-nodetostring-tests
https://github.com/FoundationDB/sql-layer/pull/1461