Fix bug in RemoteClient::GetNextBlocks
Reconnect if connection lost
Merge remote-tracking branch 'minetest/master'

Conflicts:
	src/clientiface.cpp
Merge branch 'master' of https://github.com/freeminer/freeminer
Reconnect on [long] connection
Dont exit from local game on mod error
Optimize sending blocks
Dont save unchanged blocks
Fix block deleting
remove deprecated minetest.env:
Add key-value storage api
Remove debugging code
Fix mistake in lua api
Merge pull request #64 from Selat/key-value-storage

Key value storage
Invert xy param for math mapgen (rotate world)
Reverse path order
Support bug of previous pathfinder
Merge pull request #66 from Selat/pathfinder

Pathfinder
Add .db to kv base name
save players to ldb (WIP)