demo of log(DataVec); with(df, Symbol)
Added cut() and paste() :)
More compact representation from cut.
More compact show(d::AbstractDataFrame).
A bit more work on show(d::AbstractDataFrame).
Change PooledDataVec to have a sorted pool.
Minor comments.
Add merge with an inner join implemented plus infrastructure for other
joins.
Cleanups / checking of merge.
Remove merge profiling stuff.
Add unique, order, and sort for PooledDataVec.
Merge branch 'refs/heads/DataFrameReorg' into Data

Conflicts:
	extras/data.jl

default type of empty DataFrame is ASCIIString
Merge branch 'DataPlaying' into data-merge
Merge my updated branch 'DataFrameReorg' into data-merge which has
Harlan's stuff.
Convert Index & DataFrame to use ByteString.
Added default column names. Fixed up tests a bit.
Tests and fixups for stack/unstack.
Fix cut() and paste() issues.
Initial commit
Raw code from Harlan's fork