Review: Resubmit

This should be ready for review again. I found a nice article on comparing 
signed and unsigned values:

http://jwwalker.com/pages/safe-compare.html

So, I made the remaining comparisions safe (where it was not easy or not 
possible to change the data type).
-- 
https://code.launchpad.net/~widelands-dev/widelands/compiler_warnings/+merge/278240
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