Added per screen help to ktop

BUG=chromium-os:22607
TEST=x86-64, x86-32, compiled for arm

Change-Id: I87798f8065a61f3d32e03d4715ccd11a4fcd42d5
Reviewed-on: https://gerrit.chromium.org/gerrit/11290
Reviewed-by: Luigi Semenzato <semenzato@chromium.org>
Commit-Ready: Paul Taysom <taysom@google.com>
Tested-by: Paul Taysom <taysom@google.com>
7 files changed