Revert relevant parts of f4d8d8c6a1

For the reasons of this reverting, see the thread at
<https://sourceforge.net/p/flightgear/mailman/flightgear-devel/thread/CAHtsj_eFdxLoXXoNq%3D3OKNRmyR6-FowFL97TASdQJx8N05Lmig%40mail.gmail.com/#msg35580548>,
including <https://sourceforge.net/p/flightgear/mailman/message/35584363/>,
<https://sourceforge.net/p/flightgear/mailman/message/35584803/> and
<https://sourceforge.net/p/flightgear/mailman/message/35585421/> (appearing
out-of-thread according to the SF mailing list archive).

package/make-base-package.noarch.sh

@@ -78,6 +78,7 @@ tar \
 		data/Models \
 		data/MP \
 		data/N* \
+		data/options.xml \
 		data/preferences.xml \
 		data/Protocol \
 		data/README \

src/Main/options.cxx

@@ -322,8 +322,7 @@ private:
 
     int getNumMaturity(const char * str)
     {
-        // Changes should also be reflected in
-        // $FG_INSTALL_PREFIX/share/flightgear/options.xml.
+        // Changes should also be reflected in $FG_ROOT/options.xml
         const char* levels[] = {"alpha","beta","early-production","production"};
 
         if (!strcmp(str, "all")) {