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Add sound volume controls to ingame menu
Read server_announce from minetest.conf for GUI
Merge pull request #503 from RealBadAngel/master

Add sound volume controls to ingame menu
Add seed parameter for default and L-system trees
Merge pull request #505 from RealBadAngel/master

Add seed parameter for default and L-system trees
new adjustable finite liquid
Update README
Change Minetest-c55 to Minetest
Update buildbot
Update Copyright Years
Add emerge.cpp, initial EmergeThread changes

- Neatly placed all emerge related code into a new file, emerge.cpp
- Greatly cleaned up the code in EmergeThread::Thread()
- Reworked Emerge queue.  Now an actual std::queue of v3s16 block positions
- Removed the completely unnecessary map of peer ids requesting blocks
Add global and per-peer queue limits
Fix EmergeThread hang on exit
Add emerge queue limit configuration