removed some debug prints. uncommented code block for unix.
logwindow.c: reduced debug print.
logwindow.c: modified debug print.
execute imap_cmd_ok() in another thread.
made GDK locks reentrant, and made LogWindow thread-safe.
hide PGP checkboxes if PGP is not available.
separate LogWindow from utils.c.
re-enabled the line number limit of logwindow.
replaced intl.h with glib/gi18n.h.
set shadow type of GtkTextView, and don't set border_width of toolbars.
Initial import of Sylpheed (GTK2 version).