Add LyX package

lyx.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<packages>
+	<package id='lyx' name='LyX' reboot='false' revision="%REVISION%.1">
+
+		<variable name='REVISION' value='2.0.7'/>
+		<variable name='SUBREVISION' value='3'/>
+		<variable name='MIKTEXREVISION' value='2.9'/>
+
+		<check type='uninstall' condition='exists' path='LyX %REVISION%'/>
+
+		<install cmd='%COMSPEC% /c reg add "HKLM\SOFTWARE\MiKTeX.org\MiKTeX\%MIKTEXREVISION%\MPM" /v AutoInstall /t REG_SZ  /d 0 /f'/>
+		<install cmd='%SOFTWARE%\LyX\LyX-%REVISION%-Installer-%SUBREVISION%.exe /S'/>
+		<install cmd='%COMSPEC% /c reg add "HKLM\SOFTWARE\MiKTeX.org\MiKTeX\%MIKTEXREVISION%\MPM" /v AutoInstall /t REG_SZ /d 2 /f'/>
+
+		<remove cmd='"%PROGRAMFILESWPKG%\LyX 2.0\Uninstall-LyX.exe" /S'/>
+	</package>
+</packages>