made workaround for 64-bit time_t on win32.
made export/import progress dialog cancellable.
added 'Export only selected messages' option to the export dialog.
Automatically select appropriate Junk folder on filtering.
fixed a bug that MIME flag was not set on importing mbox file.
update summary cache when importing from mbox.
show progress bar on export. modified menu label and function names.
show progressbar on mbox import.
only count for non-junk and not-deleted and not-marked-as-read messages when incorporating from mbox.
don't filter junk on import.
filter junk mails from local mbox even if prefs_common.filter_on_inc is FALSE.
filter junk mails on incorporation from local spool when filter_junk_on_recv is enabled.
merged from libsylph branch.
fixes occasional summary update failure on win32 and some filesystems.
changed the license of LibSylph from GPL to LGPL.
moved mbox.[ch] into libsylph.
added wrappers for C library function that take pathname arguments.
enabled compilation with MinGW.
replaced intl.h with glib/gi18n.h.
Initial import of Sylpheed (GTK2 version).