Runtime bytecode generation

- removed fixed local variable allocations.
TAJO-494: Extend TajoClient to run a query with a plan context serialized as the JSON form. (jihoon)
TAJO-803: INSERT INTO without FROM throws ClassCastException. (Hyoungjun Kim via hyunsik)
TAJO-823: Missing INET4 handling in DatumFactory.cast(). (jihoon)
TAJO-816: NULL delimiter doesn't apply with HCatalogStore. (jaehwa)
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/tajo into CodeGen
Runtime bytecode generation

- added vectorizedrowblock basic layout
- added new tuple.