misc/build_helpers/run_trial.py is no longer used.

Signed-off-by: Daira Hopwood <daira@jacaranda.org>
Update obsolete paths in munin plugin comments.

Signed-off-by: Daira Hopwood <daira@jacaranda.org>
Makefile: make APPNAME a variable.

Signed-off-by: Daira Hopwood <daira@jacaranda.org>