Removes unused files, executable permissions and tabs

Same intro as for pull request  #19.

This pull request removes some directories with placeholder files that aren't used, removes the executable permission from some files and replaces all tabs with spaces.

Another pull request that doesn't change any real code but hopefully brings the project in a slightly more consistent state.

Feel free to reject the pull request if you don't agree. I know developers can argue endlessly over small things like spaces vs. tabs.