[web2py] Change layout from 12 to 6 columns

[Stephen Tanner]

Now that web2py uses bootstrap for the layout, I should be able to set the 
number of columns that are used. 

According to this post on SO (
http://stackoverflow.com/questions/10742082/customizing-the-twitter-bootstrap-default-grid)
 
you should be able to edit the file *variables.less* and add

@gridColumns:             6;


Where is this file in web2py or where does it belong?


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