Coding style guide needed

The wiki refers to (non existing) coding guidelines. As we are adding contributors to the project, this will become more important.

This thought got triggered when I was looking into the ordering of #include directives. I found different orders in the code.

In my experience, the order

1. Project (corsika) headers
2. Other
   1. Third party
   2. boost
   3. STL

is a reasonable order. By having the project headers first, you are more likely to get a compile time error if a header is missing an include.

For the discussion, we should try to get feedback from @darko as auger's chief style cosmetologist. He spent some time on the attached auger offline style guide.