Add [I]REGEX function
Test another opt flag
Add deferred foreign keys DDL and DML.
Test showing Intersect_Ordered doesn't honor comparables
Handle nulls in MKeyComparables
Add the Persistit implementation.
Remove stray file.
merge nathanlws: Add [I]REGEX function

Merge pull request #1223 from nathanlws/sql-layer/add-regex
https://github.com/FoundationDB/sql-layer/pull/1223
Use TComparisons for comparing jump rows
Avoid null filled comparison list
Stale import
Don't generate tree names longer than the max supported.

Fixes #741
Test self-fk across differing types
Use KeyComparable for checking self-reference
Fix header
merge MMcM: Deferrable foreign key support

Merge pull request #1225 from MMcM/sql-layer/deferrable-foreign-key
https://github.com/FoundationDB/sql-layer/pull/1225
More SET CONSTRAINT cases
Should be else if
Make more ForeignKey protobuf fields optional for old databases.
merge nathanlws: Always use TComparisons in Intersect_Ordered

Merge pull request #1226 from nathanlws/sql-layer/fix-intersect-different-types
https://github.com/FoundationDB/sql-layer/pull/1226