Remote whitespace at the ends of lines.
Remove blank lines from the ends of files.
Change modes on source files so that they
are not executable.

Signed-off-by: Dan Cross <cross@gajendra.net>

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

Since Google (and a lot of the outside) is so engrained with using
^C as interrupt, I'd like to be able to use it in 9term if I've
stty'd my intr to ^C. Without this, hitting ^C still works but if
the program behind the window isn't reading from /dev/cons, it won't
take effect till after I hit a newline which is often very confusing.

I know this is a hack since it only works if I stty intr ^C but that
seems the only other character that gets used anyways.

Change-Id: I0597e63b2d7628f5668c648e6dba6f281e4b27fd
Reviewed-on: https://plan9port-review.googlesource.com/2742
Reviewed-by: Russ Cox <rsc@swtch.com>

Change-Id: I75563b911b54d8957d2d004b9c27d0a2f8f043b3
Reviewed-on: https://plan9port-review.googlesource.com/1390
Reviewed-by: Russ Cox <rsc@google.com>

R=rsc
http://codereview.appspot.com/6847105

R=rsc
CC=plan9port.codebot
http://codereview.appspot.com/4952066

R=rsc
http://codereview.appspot.com/4830052

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

R=rsc
CC=codebot
http://codereview.appspot.com/854042