exit gracefully when user tries to run two instances of pyVCP "Error: Only one running pyVCP allowed."
exit gracefully when user tries to run two instances of pyVCP
"Error: Only one running pyVCP allowed."

unseenlaser/machinekit,bobvanderlinden/machinekit,bobvanderlinden/machinekit,cdsteinkuehler/MachineKit,mhaberler/machinekit,mhaberler/machinekit,jaguarcat79/ILC-with-LinuxCNC,RunningLight/machinekit,cdsteinkuehler/linuxcnc,EqAfrica/machinekit,araisrobo/machinekit,Cid427/machinekit,araisrobo/machinekit,narogon/linuxcnc,Cid427/machinekit,bmwiedemann/linuxcnc-mirror,bobvanderlinden/machinekit,ianmcmahon/linuxcnc-mirror,yishinli/emc2,cdsteinkuehler/linuxcnc,aschiffler/linuxcnc,jaguarcat79/ILC-with-LinuxCNC,cdsteinkuehler/linuxcnc,araisrobo/machinekit,cdsteinkuehler/MachineKit,araisrobo/machinekit,yishinli/emc2,unseenlaser/machinekit,ianmcmahon/linuxcnc-mirror,kinsamanka/machinekit,ikcalB/linuxcnc-mirror,Cid427/machinekit,bmwiedemann/linuxcnc-mirror,ikcalB/linuxcnc-mirror,RunningLight/machinekit,ArcEye/MK-Qt5,kinsamanka/machinekit,cnc-club/linuxcnc,ArcEye/MK-Qt5,cdsteinkuehler/MachineKit,araisrobo/machinekit,ArcEye/machinekit-testing,araisrobo/linuxcnc,aschiffler/linuxcnc,ikcalB/linuxcnc-mirror,cnc-club/linuxcnc,RunningLight/machinekit,unseenlaser/linuxcnc,aschiffler/linuxcnc,araisrobo/machinekit,ArcEye/machinekit-testing,narogon/linuxcnc,ArcEye/machinekit-testing,mhaberler/machinekit,EqAfrica/machinekit,araisrobo/machinekit,unseenlaser/machinekit,strahlex/machinekit,unseenlaser/machinekit,araisrobo/linuxcnc,narogon/linuxcnc,Cid427/machinekit,Cid427/machinekit,ArcEye/machinekit-testing,bobvanderlinden/machinekit,aschiffler/linuxcnc,ArcEye/machinekit-testing,cdsteinkuehler/linuxcnc,cnc-club/linuxcnc,unseenlaser/linuxcnc,kinsamanka/machinekit,narogon/linuxcnc,bobvanderlinden/machinekit,ianmcmahon/linuxcnc-mirror,yishinli/emc2,unseenlaser/machinekit,cdsteinkuehler/linuxcnc,ArcEye/MK-Qt5,mhaberler/machinekit,bobvanderlinden/machinekit,cnc-club/linuxcnc,Cid427/machinekit,kinsamanka/machinekit,ianmcmahon/linuxcnc-mirror,mhaberler/machinekit,mhaberler/machinekit,bobvanderlinden/machinekit,ArcEye/MK-Qt5,RunningLight/machinekit,kinsamanka/machinekit,unseenlaser/machinekit,araisrobo/machinekit,ikcalB/linuxcnc-mirror,ArcEye/MK-Qt5,bobvanderlinden/machinekit,mhaberler/machinekit,unseenlaser/linuxcnc,narogon/linuxcnc,Cid427/machinekit,unseenlaser/linuxcnc,ianmcmahon/linuxcnc-mirror,bmwiedemann/linuxcnc-mirror,bmwiedemann/linuxcnc-mirror,ikcalB/linuxcnc-mirror,araisrobo/linuxcnc,kinsamanka/machinekit,kinsamanka/machinekit,ArcEye/machinekit-testing,strahlex/machinekit,araisrobo/linuxcnc,araisrobo/machinekit,EqAfrica/machinekit,cnc-club/linuxcnc,unseenlaser/linuxcnc,mhaberler/machinekit,EqAfrica/machinekit,aschiffler/linuxcnc,yishinli/emc2,strahlex/machinekit,bmwiedemann/linuxcnc-mirror,ArcEye/MK-Qt5,bmwiedemann/linuxcnc-mirror,strahlex/machinekit,cnc-club/linuxcnc,ianmcmahon/linuxcnc-mirror,RunningLight/machinekit,ArcEye/MK-Qt5,cnc-club/linuxcnc,cdsteinkuehler/MachineKit,EqAfrica/machinekit,RunningLight/machinekit,EqAfrica/machinekit,RunningLight/machinekit,strahlex/machinekit,jaguarcat79/ILC-with-LinuxCNC,EqAfrica/machinekit,ArcEye/MK-Qt5,EqAfrica/machinekit,ArcEye/machinekit-testing,araisrobo/linuxcnc,jaguarcat79/ILC-with-LinuxCNC,ianmcmahon/linuxcnc-mirror,RunningLight/machinekit,cdsteinkuehler/MachineKit,ArcEye/machinekit-testing,kinsamanka/machinekit,unseenlaser/machinekit,ikcalB/linuxcnc-mirror,unseenlaser/machinekit,strahlex/machinekit,Cid427/machinekit,jaguarcat79/ILC-with-LinuxCNC,cdsteinkuehler/MachineKit,ikcalB/linuxcnc-mirror,cdsteinkuehler/linuxcnc,strahlex/machinekit,bmwiedemann/linuxcnc-mirror