change indentation from 2 spaces to 4 spaces (or tabs ?)

[Luro02]

I think it's a bit hard to read the source code especially because the indentation looks "squashed"....

[GreatWizard]

You can also change your editor display settings without change the whole source code ;)

[Ickerday]

It's a very subjective thing - I like 2 spaces more.