tmac: rename IM (italic manual) to MR (manual reference) Suggested by G. Brandon Robinson.

tmac: introduce real manual reference macro instead of overloading IR The overloading of IR emits magic \X'...' sequences that turn into HTML manual links. But not all such IR invocations should be manual links; those had to be written to avoid the IR macro before. Worse, the \X'...' ending the IR causes troff to emit only a single space after a period. Defining a new IM macro for manual references fixes both problems. Fixes #441.

9term: add a "look" menu item (#299) Add a menu item which functions similar to acme's `Look` command. This is copied from 9front. See: https://code.9front.org/hg/plan9front/rev/1f1596dbca51 https://code.9front.org/hg/plan9front/rev/d2de1d2f7b48

man1: document mouse keystrokes in acme, sam, 9term Change-Id: Id99ce9a143a21009d93a1c6ba2d1f84a3588649f Reviewed-on: https://plan9port-review.googlesource.com/2942 Reviewed-by: Russ Cox <rsc@swtch.com>

man: document font syntaxes Change-Id: Id441d4df192c47388af6b5da306f14d90f066d18 Reviewed-on: https://plan9port-review.googlesource.com/1173 Reviewed-by: Russ Cox <rsc@swtch.com>

9term, acme: autoscroll Ignore scroll/noscroll window setting. Instead, scroll when the write begins in or immediately after the displayed window content. In the new scrolling discipline, executing "Noscroll" is replaced by typing Page Up or using the mouse to scroll higher in the buffer, and executing "Scroll" is replaced by typing End or using the mouse to scroll to the bottom of the buffer. R=r, r2 http://codereview.appspot.com/4433060

9term: add -c to force cooked mode R=rsc CC=codebot http://codereview.appspot.com/1044043

merge

update

document bash stupidity

Many small edits.

use macro for /usr/local/plan9

Some man pages.

some needed manual pages