Incremented version number to 0.3.7

When saving files an older version number is used if that version of MSE would be able to open the set

git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@1011 0fc631ac-6414-0410-93d0-97cfa31319b6

src/data/set.cpp

@@ -119,6 +119,7 @@ String Set::identification() const {
 
 
 String Set::typeName() const { return _("set"); }
+Version Set::fileVersion() const { return file_version_set; }
 
 // fix values for versions < 0.2.7
 void fix_value_207(const ValueP& value) {