Fixed stupid coding mistake in CBotString.cpp
Updated info in README files
Updated info in README files
Sort translation files.

This will ease future updates.
Handle translations with CMakes.

closes #81
Update translations with newer colobot.pot.
Merge pull request #82 from OdyX/i81_fix_translations

Sorted translations alphabetically and created CMake rules for generating pot files.
Inherit translation setting from environment.

This ensures that users with a correctly-defined locale don't need to
explicitely set the locale.

- By dropping the setlocale content, it fixes the loading of translations.
- Add a Debug log message to check what is put in the environment.
Add FindLTDL cmake module

As mentionned in FindLTDL.cmake, this is code that is hereby relicensed
under GPLv3.

closes #68
Use system-provided Google test library.

This avoids library duplication, in favour of a shared (source) library:
libgtest-dev is available at least on Debian, Ubuntu, Gentoo, Fedora, at
the time of committing.

If the library is not found in system paths, a copy of it in lib/gtest
can work too.
Merge pull request #86 from OdyX/cmake_find_gtest

Use system-provided Google test library.
Merge pull request #83 from OdyX/fix_i18n_from_env

Inherit translation setting from environment.
Merge pull request #85 from OdyX/cmake_find_ltdl

Add FindLTDL cmake module
Reverted lib/, fixed gtest path in CMakeLists.txt

Some gtest system packages use name gtest-all.cc.
lib/ directory should be left in repository.
Merge branch 'master' into dev
Split gtest and gmock, fixed using system packages

- split the bundled gtest and gmock libraries
- allowed the use of system gmock
- refactoring in CMakeLists
Fix Google Mock system library building
GMock: fixed using system package
Merge pull request #89 from OdyX/dev-fix-gmock

Fix Google Mock system library building
Set a default datadir, in sync with the data installation path.