Use round if falling node is misplaced

Fixes: http://i.imgur.com/arAWw1i.png (middle-right)
updatepo.sh: Find all files
Fix android build using hardcoded path for data instead of using the one fetched by android api on init.
Fix android missing version information
Simplify player modification checks
Only set player dirty flag if values change
Make players check inventory modification properly
Add optional framed glasslike drawtype
Fix minetest_game installation