Generate PID name based on script name

Fixes #533

cronjobs/run-crons.sh

@@ -9,9 +9,6 @@
 # PHP Detections, if this fails hard code it
 PHP_BIN=$( which php )
 
-# Path to PID file, needs to be writable by user running this
-PIDFILE='/tmp/mmcfe-ng-cron.pid'
-
 # List of cruns to execute
 CRONS="findblock.php proportional_payout.php pplns_payout.php pps_payout.php blockupdate.php manual_payout.php auto_payout.php tickerupdate.php notifications.php statistics.php archive_cleanup.php"
 
@@ -24,6 +21,12 @@ VERBOSE="0"
 #                                                              #
 ################################################################
 
+# My own name
+ME=$( basename $0 )
+
+# Path to PID file, needs to be writable by user running this
+PIDFILE="/tmp/$ME.pid"
+
 # Overwrite some settings via command line arguments
 while getopts "hvp:" opt; do
   case "$opt" in