Version 0.1.3

Added `DropNA` to drop observations in a data frame with missing values for given variables.


Version 0.1.2

Stop message for `MoveFront` when variable does not exists. Other minor documentation changes.

Version 0.1.1 

Minor update to `FillIn` for data.frame 1.8.8.

Version 0.1

First version including the `FillIn` and `MoveFront` commands.