pivot strawman

- pivot support first cut
- replace == to =:= for type comparison
column accessor code cleanup
file input(csv) testcase
type guessing based on random sample of 1%
pivot test case

- also all tests with kryo
- parse error test, broken: need to use accumulable
- upto 10x10 element printing
fix parseErrors, need to trigger accumulation
faster guessing of type
- mark some values as NA
- bug fix in DF.list output
- pivot generalized to both datatypes
- faster column to column comparison
- test for markNA and pivot
cosmetic
cosmetic
Merge pull request #4 from AyasdiOpenSource/pivot

add "pivot" transform, other bug fixes, improvements