Also add note for 64-bit Windows users

* Update README.txt

As of Ubuntu 16.10, libpng12-dev is replaced with libpng12-0, since libpng12-0 is available in 16.04 repositories, I think that needed to be changed.

Also I changed 'git-core' to 'git' for fedora users, keep it consistent with the ubuntu/debian instructions.

* Update README.txt

The package docs for the git-core Ubuntu package in all supported
Ubuntu versions, including 12.04 say:

This is a transitional dummy package.  The 'git-core' package has been
renamed to 'git', which has been installed automatically.  This git-core
package is now obsolete, and can safely be removed from the system if no
other package depends on it.

Fixes #4109

Edited packages to reflect correct packages

-Complies with the Linux standard freedesktop icon naming specs: http://standards.freedesktop.org/icon-naming-spec/icon-naming-spec-latest.html#guidelines
-Ensures compatibility with icon themes
-Edit minetest.desktop, CMakeLists.txt and README.md to reflect this change

Uses system provided libgmp if found, if not it falls back to mini-gmp.

On Debian 8...
```
Package libjpeg8-dev is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
  libjpeg62-turbo-dev
```
Using libjpeg-dev should make the OS select the most appropriate lib to be installed.
These are the packages available on Debian 8.
```
libjpeg-dev - Development files for the JPEG library [dummy package]
libjpeg-turbo-progs - Programs for manipulating JPEG files
libjpeg-turbo-progs-dbg - Programs for manipulating JPEG files (debugging symbols)
libjpeg62-turbo - libjpeg-turbo JPEG runtime library
libjpeg62-turbo-dbg - Debugging symbols for the libjpeg-turbo JPEG library
libjpeg62-turbo-dev - Development files for the libjpeg-turbo JPEG library
libturbojpeg1 - TurboJPEG runtime library - SIMD optimized
libturbojpeg1-dbg - TurboJPEG runtime library - SIMD optimized (debugging symbols)
libturbojpeg1-dev - Development files for the TurboJPEG library

```
This seems to work on all current Debian versions, Wheezy, Jessie and Sid.
https://packages.debian.org/wheezy/libjpeg-dev
https://packages.debian.org/jessie/libjpeg-dev
https://packages.debian.org/stretch/libjpeg-dev

Im not sure if Ubuntu has this dummy package.

http://packages.ubuntu.com/search?keywords=libjpeg-dev

Perhaps this should be further discussed.

libjpeg8-dev -> libjpeg-dev

  * Combine client and server man pages.
  * Update unit test options and available databases in man page.
  * Add `--worldname` to man page.
  * Fix a bunch of places where `"Minetest"` was used directly instead of `PROJECT_NAME`.
  * Disable server build by default on all operating systems.
  * Make `ENABLE_FREETYPE` not fail if FreeType isn't found.
  * Enable LevelDB, Redis, and FreeType detection by default.
  * Remove the `VERSION_PATCH_ORIG` hack.
  * Add option to search for and use system JSONCPP.
  * Remove broken LuaJIT version detection.
  * Rename `DISABLE_LUAJIT` to `ENABLE_LUAJIT`.
  * Rename `minetest_*` variables in `version.{h,cpp}` to `g_*`.
  * Clean up style of CMake files.

* prefix apt-get with sudo
* git clone minetest_game without going to folder
* execute minetest binary without going into bin folder

Also simplify wget steps and apt-get install zlib1g-dev libjsoncpp-dev

Add ZLIBWAPI_DLL and LEVELDB_DLL CMake options Remove legacy MINGWM10_DLL CMake option Update 32-bit buildbot (OpenAL updated, zlib updated) Change build directory for buildbots to '_build' to prevent removal of Android build files Use -win64 suffix for 64-bit Windows builds Fixes #1476

Clean and optimize clouds.cpp enough to not really contain any of the small amount of non-LGPLv2/later code left

Switch the license to be LGPLv2/later, with small parts still remaining as GPLv2/later, by agreement of major contributors