Build on Windows.

--HG--
branch : develop
Use postfix .txt for text files, usefull for Windows systems.

--HG--
branch : develop
rename : AUTHORS => AUTHORS.txt
rename : ChangeLog => ChangeLog.txt
rename : LICENSE => LICENSE_GPL.txt
rename : README => README.txt
rename : src/libs/qmuparser/License.txt => src/libs/qmuparser/LICENSE_BSD.txt
NSIS scripts. File association. Changed path to start-menu. Fixed uninstall
method.

--HG--
branch : develop
Better way restoring a window's geometry.

--HG--
branch : develop