replaced 'struct stat' with GStatBuf.
when deleting email from group, only remove from group list and not from person.
fixed crash bug when an address in a group was modified. Fixed memory leaks.
use GDir instead of directly using opendir().
added wrappers for C library function that take pathname arguments.
added constant C_INTERNAL and CS_INTERNAL.
Initial import of Sylpheed (GTK2 version).