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You can call me names... but tabs are evil...
When I touched CMakeLists.txt last time, I've seen some tabs lurking there. I've made a vow to eliminate them. Then I looked around and found some more. These three patches kill'em all in three parts of the repository: in CMakeLists.txt, in the tools directory, and among the tests.
Side note: there are quite some style issues left over in the tests (number of spaces used for indentation, presence vs absence of space between function names and parameter lists, placement of curly braces, etc) but these patches do not intend to unify them.