Fix errors in src/ that cppcheck yielded with the default configuration
Fix last error
Fix further issues
Revert change in irr_driver.cpp
Allow to set custom ratio for images from xml file.

It avoids crashes and memory leaks after changing resolution.
Tweak the snow
Restore screenshot properties
Merge branch 'master' of https://github.com/supertuxkart/stk-code
Fix invalid snow particles XML file that would cause assertion failures
Fix LOD issues in multiplayer, fixes #1710
Fixed compiler warnings.
Merge branch 'cppcheck' of https://github.com/tobbi/stk-code into tobbi-cppcheck
The (float) cast is not necessary, and makes it harder to read.
Use proper format (instead of casting unsigned to int).
Better handle out-of-memory situations.
Merge branch 'tobbi-cppcheck'
Updated pot file (just to check launchpad integration, no string freeze yet).
Fixed my "Better handle out-of-memory situations." ... to now actually work :P
Fix #1620 (Player's achievements can only be seen when logged in).