Code assumes 4-character tabs

[GoogleCodeExporter]

Another tiny quibble of no great importance.  :-)

Tabs and spaces are used interchangeably, and it's clear that the assumption is 
that one tab is equal to 4 spaces. 

This doesn't work on github, where tabs are 8 characters, nor on my personal 
editor environment, where it appears that tabs are 2 characters.

Best solution - get rid of all embedded tab characters, as they are problematic 
when creating code that will be viewed on the web.

Original issue reported on code.google.com by tom.ritc...@gmail.com on 10 Jun 2013 at 5:58