Work in sql(ite) data descriptor
Make ckernel rewriter respect execution tactics
Generate simple sql select queries
Merge branch 'pyinterp' into sqlddesc2

Conflicts:
	blaze/compute/air/passes.py
Pull data in lazily in SQL data descriptor, handle single columns
Fix some sql ops and partitioning, work on predicates
Work on SQL example set
Remove old sql interpreter
Add SQL syntax module
Test SQL query generation
More work on SQL syntax, rewrite SQL expressions to SQL queries
Use SQL expression syntax from SQL blaze implementations
Test SQL queries on record arrays
Work on understandable error messages
Test and fix some sql ufuncs
Add some sql functions and tests
Improve some where queries
Merge branch 'master' into sqlddesc
Merge branch 'master' into sqlddesc
Fix issue with ckernel and jit dispatching code