New Sheet

[John Darrington]

For those who are interested:

I have put an updated tarball at 
http://darrington.wattle.id.au/efficient-sheet-0.3.tar.gz

I have also pushed a new branch called "sheet".  To use this branch you need to 
copy
the above tarball directory (or symlink it) to src/ui/gui/efficient-sheet.  
Needless to say,
it is all highly experimental at the moment.  You can expect lots of things not 
to work,
but it does should how a large dataset can be loaded and iterated without 
adding a 
significant load.  

All gui operations are O(1) in time and space, both in the number of variables 
and the 
number of cases.

J'


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