resources when it is closed.
(register_channel): Register the channel's resources list as an
item on the connection's.
(init_channel): Initialize resources list.
(make_channel_read_close_callback): Renamed from
make_channel_close_callback, for the same reason.
(channel_io_exception_handler): Exception handler to close the
channel on i/o errors. Primarily useful for fd:s the channel
writes to.
(make_channel_io_exception_handler): New function.

* src/channel.c (channel_read_close_callback): Renamed from
channel_close_callback. The previous behaviour, which used the
callback for fd:s the channel writes to, was completely bogus.

* src/channel.c (channel_close): Do nothing if we have already
sent CHANNEL_CLOSE.
(channel_eof): Do nothing if we have already sent CHANNEL_EOF, or
either sent or received CHANNEL_CLOSE.

* src/channel.h (ssh_channel): Added a resources attribute.

Rev: src/channel.c:1.59
Rev: src/channel.h:1.45