Corrected markdown formatting in INSTALL
Add a PLATFORM_GNU global variable matching all GNU systems such as Debian's Linux, kFreeBSD and Hurd
Merge pull request #259 from OdyX/dev-fix-non-linux

Fix GNU non-Linux platforms
Changed char[] to std::string in restext

Experimental changes
Never cache Data, Sound and Music paths

Let them always be either auto-detected, defined on the command-line
or written in the configuration file
Sound support changes

* removed 2d sound
* fixed listener orientation (propably issue #235)
* removed unused code and minor refactoring
Some further refactoring and test corrections
Fix problem with gtest and pthread on some systems
Merge branch 'dev-string-in-restext' into dev

Merging branches after code review

This should fix buffer overflow problems with translation strings
Updated data submodule
Updated data submodule
Fixed AudioChange
Fixed bug #240 - CAuto in produce()
Added WSAD as secondary controls (#231)
Fixed "default controls" button (#263)
Added "E" as a secondary action button

As requested by @Emxx52 on IRC
Fixed build of stringutils.cpp

    /var/www/colobot_compiled/colobot/dev/colobot/src/common/stringutils.cpp:33:51: error: 'vsnprintf' was not declared in this scope
Fix for #264 - some translations not working
.takeoff() for SpaceShip (#265)
Updated data submodule