Revision 353

iso_connect, mcs_connect and sec_connect now takes a username as an argument.

mcs_recv fills in a channel id in a pointer argument.

process_orders takes the number of orders as an argument instead of figuring it out itself.

Exported process_bitmap_updates and process_palette and sec_decrypt
as non-static functions.

New public functions: process_colour_pointer_pdu (rdp.c),
                      process_cached_pointer_pdu (rdp.c),
                      process_null_system_pointer_pdu (rdp.c),
		      rdp5_process (rdp5.c),
		      rdp5_process_channel (rdp5.c)