Added boolean type for method describeColumns.
Code cleanup for adapters.
(cherry picked from commit 374a4ad)
Added constraint creation for foreign key.
(cherry picked from commit ef32f97)
Unit test corrected to check CONSTRAINT, sqlite adapter has been corrected.
(cherry picked from commit a1a61e3)
Tabs and memory leak fixes.
(cherry picked from commit 44902a9)
Fixes after merging with 1.3.0.