Improve default parameters
Update and improve documentation
Unhide mapgen, but is still unstable

Fixes bug for which commit

6c37e89f "Fix old client showing duplicated health bar on new server"
by @sapier

laid the groundwork, where the server has
updated its copy of the hud flags without
respecting the mask.

Fixes #3395.

Flag is set by default in MapgenParams
The global 'trees' flag remains but is now
undocumented and unset by default in MapgenParams
Add mgv6_spflag 'trees' set by default in
defaultsettings.cpp to affect new worlds only
This is automatically backwards
compatible for existing worlds

Recent irrlicht revisions break the build, hardcode the revision to a working one
until upstream publishes a working version. See issue #3366 for
a discussion about this.

Also update dependencies to current versions.

Currently translated at 42.0% (331 of 787 strings)

Currently translated at 45.8% (361 of 787 strings)

Currently translated at 32.4% (255 of 787 strings)

Currently translated at 45.7% (360 of 787 strings)

Currently translated at 45.6% (359 of 787 strings)

Currently translated at 100.0% (787 of 787 strings)

Currently translated at 26.3% (207 of 787 strings)

-

Currently translated at 11.8% (93 of 787 strings)

Currently translated at 31.6% (249 of 787 strings)

Currently translated at 31.6% (249 of 787 strings)

Currently translated at 41.4% (326 of 787 strings)

Currently translated at 100.0% (787 of 787 strings)

Currently translated at 9.2% (73 of 787 strings)

Currently translated at 100.0% (787 of 787 strings)

Currently translated at 100% (0 of 0 strings)

Created new translation.

Currently translated at 21.4% (169 of 787 strings)

Currently translated at 44.0% (347 of 787 strings)

Currently translated at 25.4% (200 of 787 strings)

Currently translated at 40.2% (317 of 787 strings)

Currently translated at 100.0% (787 of 787 strings)

Currently translated at 96.8% (762 of 787 strings)

* Remove trailing lines from src/sound_openal.cpp
* Don't do a horribly ugly copy of the file's path, allocating and deallocating a
	10 kb buffer in the process. This copy was needed for backwards compatibility
	with libvorbis 1.3.1 and earlier, as the removed comment explains.
	However, even Ubuntu precise has 1.3.2 already. Dropping support and sparing
	the ugly copy can therefore be considered safe.
* Actually load sounds from the memory, not caching them at the disk first,
	removing the old hack. This is the main motivation for the commit.

For a decoration count between 0 and 1 calculate a chance for 1

Add mgv6 spflag 'flat'
Global flag is kept for backwards compatibility but is now undocumented

Fix regression of commit

5e507c98 "Add server side ncurses terminal"

which allowed all players, even those without a shout priv, to chat.

Fixes #3362.

The player name is now added in the field "dropped_by" on the created
entity.

In addition to being a better random, this fixes #3228

Remove CaveFractal
Add a lava depth constant to CaveV5 to make it universal