* This commit has a lot of changes primarily done for Linux packaging
 + Added debian/ folder that contains files to build an elementary OpenViBE Debian/Ubuntu/Mint package 
 * All OpenViBE libraries and executables now have lowercase filenames in the filesystem
 * The "-dynamic" postfix is no longer appended as dynamic linking is the default. Static builds still retain the "-static" postfix. Note also that the static-linking builds may have broken at some point as they're not used in devel/test cycle. Static linking can be fixed/supported later if needed (let us know).  
 * Launch scripts:
   - The launch scripts are now be called openvibe-*.
   - On Linux, launch scripts (.sh extension) are only be used for development. There is no need to package them. 
   - On Linux, Openvibe related environment path variables are not used by default, but they can be set in the (development) launch scripts if desired to override the install location set by CMake.
   - On Windows, launch scripts (.cmd) are still needed and installed to install root.
   - On Windows, only environment variable that remains is OV_PATH_ROOT, which the launch scripts set as their location in the filesystem. The install tree is assumed to be a fixed one in a known relative position to the script location. 
 * Directories.h: in case the OV_PATH_* ENV variables are not set, the path getters return locations defined by CMake and the install targets that were specified at build time
 * Plugins.cfg of Ogre is now called openvibe-ogre-plugins.cfg and installed to "share/". Removed the executable bit from it.
 * All OpenViBE subprojects now by default copy the version numbers from the global variables set in the main CMakeLists.txt. If you wish to maintain unique versions for a subproject, you can change the version in that project's own CMakeLists.txt.
 * External Application Launcher:
   - External Application Launcher entry in openvibe.conf is now specified with a path token instead of ENV var.
   - External Application Launcher now takes as a parameter the name of the actual openvibe executable(!), NOT the launcher script as before. This is to retain compatibility with Linux package that may not have the launcher scripts.
   - INCOMPATIBILITY: This will introduce an issue with scenarios that have relied on the previous behaviour. This has been taken care of in scenarios included with OpenViBE.
 + Added Boost_System and X11 dependencies to kernel as Linux packaging on Mint/Ubuntu ("lintian") was complaining of missing deps
 + Added FindThirdPartyBoost_System.cmake
 + Added FindThirdPartyPThreadsVCE2.cmake, changed acquisition server CMakeLists.txt to use it instead of hardcoding (FieldTrip driver relies on this on Win)
 * Updated README to contain a bit less of information that is likely to go stale.
 * Unified and cleaned up the Linux CMake build so that it uses CMake variables for paths like the Windows build does, not environment variables.
applications/acquisition-server:
 * Changed some acquisition server drivers to use ${Path_Bin} instead of Directories::getBinDir().
openvibe-scenarios:
 * Lua scripts: removed the first line mentioning interpreter as it can be in different locations on different Linux distros. Also, these .lua files are not executed from a shell command line, so the line is not strictly needed.
 * SSVEP-Demo: Converted the two separate launching scripts into one script that takes shooter/training as a parameter. This is because after Linux packaging, we have no launch scripts, but would still like the SSVEP scenario to be runnable from the package. SSVEP scenario makes the same external app call on Linux and Windows systems, but if we're on a Linux package there'll be just one executable, not two scripts.
 * Fixed a show-stopping typo in classifier-training-flipswitch.lua
openvibe-modules:
 * Moved matroska_ebml_syntax.txt to openvibe-modules/ebml/ from the share/ root.
kernel:
 * Designer default work path in openvibe.conf is now share/openvibe-scenarios/


git-svn-id: svn://scm.gforge.inria.fr/svn/openvibe@3563 c330d7e9-fc0c-0410-a5b3-fd85c6f5aa8f