Give TClass a method to get the corresponding JDBC type id, just as TInstance can get a DataTypeDescriptor.
Update Direct to use those in place of AkType.
Reenable the direct data-type tests.
Fix the actual problem with getTime.
merge MMcM: Make Direct based on JDBC types not AkTypes

Merge pull request #1104 from MMcM/sql-layer/direct-more-like-jdbc
https://github.com/FoundationDB/sql-layer/pull/1104