added 'Junk' special folder and automatically create it when not exist.
fixed style modification of folder property dialog.
some modification of searching.
implemented query search and virtual folder (merged from newsearch branch).
fixed focus problem in win32.
enabled the property of the top folder.
fixed the label 'Type' not aligned to right at folder property dialog.
added file system path info to folder prefs.
separated UI code from prefs.c.
display path in folder property with GtkLabel.
replaced intl.h with glib/gi18n.h.
Initial import of Sylpheed (GTK2 version).