Autosave all the game on zone change is now configurable in the game options.
Saving each level individualy is now an option in the game options. This will make sure the game only keeps one level in memory (thus reducing the need for memory) but incur a small save/load on each level changes.


git-svn-id: http://svn.net-core.org/repos/t-engine4@1941 51575b47-30f0-44d4-a5cc-537603b46e54