Bug#677517: minetest 0.4 unstable version

[Matthew Bekkema]

I've made some more improvements in this one. I added the upstream
changelog, made a python script to check for updates and fixed the man
pages.

minetest:
http://mentors.debian.net/debian/pool/main/m/minetest/minetest_0.4.3.20120909+dfsg-0.1.dsc

minetest-game-full:
http://mentors.debian.net/debian/pool/main/m/minetest-game-full/minetest-game-full_0.4.3-0.1.dsc