Add wrapper scripts (start-cpulimit.sh, kill.sh) to assist running PyLink under cpulimit

Again, we're trying to prevent the software from frying people's CPUs...

kill.sh

@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+# Script to kill PyLink quickly when running under CPUlimit, since
+# it will daemonize after threads are spawned and Ctrl-C won't work.
+
+kill $(cat pylink.pid)
+echo 'Killed. Press Ctrl-C in the PyLink window to exit.'

start-cpulimit.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+# Shell script to start PyLink under CPUlimit, killing it if it starts abusing the CPU.
+
+# Set this to whatever you want. cpulimit --help
+LIMIT=50
+
+# Change to the PyLink root directory.
+WRAPPER_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+cd "$WRAPPER_DIR"
+
+if [[ ! -z "$(which cpulimit)" ]]; then
+	# -k kills the PyLink daemon if it goes over $LIMIT
+	# -z makes cpulimit exit when PyLink dies.
+	cpulimit -l $LIMIT -z -k ./main.py
+	echo "PyLink has been started (daemonized) under cpulimit, and will automatically be killed if it goes over the CPU limit of ${LIMIT}%."
+	echo "To kill the process manually, run ./kill.sh"
+else
+	echo 'cpulimit not found in $PATH! Aborting.'
+fi