gremlin: added error reporting for errors on bad gcode program load. duplicates similar code in axis.py, but sends errors to stderr via a subclassable method. psha to add handler in gladevcp gremlin widget to support.
gremlin: added error reporting for errors on bad gcode program load. duplicates similar code in axis.py, but sends errors to stderr via a subclassable method. psha to add handler in gladevcp gremlin widget to support.

Signed-off-by: Michael Haberler <46f1a0bd5592a2f9244ca321b129902a06b53e03@mah.priv.at>

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