version 0.4-1
- exported sum.ff, because RecordLinkage fails...

version 0.4
- Added ffdfdply function 
- Added ffwhich function
- Added hist.ff function
- Added quantile function

version 0.3
- Added ffdfsave function that can be used to save an ffdf data.frame

version 0.2-2
- bug fix, subset for ffdf now works properly (thanks to Martijn Tennekes)

version 0.2-1
- bug fix, sum.ff with na.rm=TRUE is now working correctly (thanks to Andreas Borg)

version 0.2
- initial version