* Blank cell reference when deselecting cells. (Eg New command).

* Strip leading/trailing whitespace on data in cells.

* Cell Ref Entry populate/depopulate.

* Case weights.

* Goto Variable.

* Widen columns in var sheet as necessary to accomodate non-english translations.

Wishlist
========

* Cut/Paste Buffer.  Cut and paste: a) Between psppire instances. b) From other applications.

* In datasheet, add tooltips to column buttons, so that hovering over a column button displays 
  the label for that variable.

* GtkSheet should implement the AtkTable interface, to allow psppire to become accessible to disabled users.