Re-enabled the gtk_window_present() call for Windows to pop up the main window.
Enabled notification if file on disk has changed under Windows, it seems to work (closes #1557689).


git-svn-id: https://geany.svn.sourceforge.net/svnroot/geany/trunk@835 ea778897-0a13-0410-b9d1-a72fbfd435f5