autogen.sh: prettify

Uniformly quote strings, and remove redundant pieces like </dev/null
when the program doesn't accept anything on stdin.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
rtorrent.1.xml: remove schedule and schedule_remove

They were deprecated a long time ago.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
rtorrent.1.xml: clearly demarcate DHT settings

DHT stuff is clearly demarcated in the code, so let the manual also
follow along.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
rtorrent.1.xml: add more DHT variables

Use TODO placeholders for the moment.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
rtorrent.1.xml: document set_* functions for throttle

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
rtorrent.1.xml: document (max|min)_(uploads|downloads)

Only max_uploads was documented previously.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
rtorrent.1.xml: nuke a bunch of deprecated on_* functions

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
rtorrent.1.xml: nuke deprecated stop_on_ratio

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>