[PATCH] NNTP_READ_TIMEOUT -> tinrc.nntp_read_timeout_secs

[Dennis Preiser]

doc/TODO:
| o make NNTP_READ_TIMEOUT user configurabe via tinrc/serverrc?
| [20110907 Urs Janssen <***@tin.org>]

I've converted NNTP_READ_TIMEOUT into a tinrc variable that can be
changed via the 'M'enu.

Dennis