Promote HACK to "we know what we're doing"

We agreed that "it's a feature not a bug", the issue is closed, and I'm
still certain that this is necessary and ok. Hence, I'm humbly replacing
the "HACK" flag with normal documentation.

src/main/INIParser.cc

@@ -621,9 +621,13 @@ void INIParser::writeIni(const QString &outfile_name, const bool &alphabetical)
 	outputIni(ss, alphabetical);
 	outfile.close();
 	
-	//HACK when creating from scratch an ini file and trying to read a key from a Workflow panel, 
-	//the key is not found because MainWindow relies on another INIParser.
-	//This hacks fixes this problem, but it is very ugly...
+	/*
+	 * When creating an INI file from scratch, it is not connected to the file system yet.
+	 * So we do this when writing out an INI file here so that the Workflow panel can
+	 * access INI keys and so that we are in the same state as if the user had edited this
+	 * file with an external program and then loaded it into INIshell.
+	 * I. e., we mimick the usual "save as" behaviour.
+	 */
 	if (getMainWindow()->getIni() != this) getMainWindow()->setIni( *this );
 }