task: fix an MDI queueing bug
task: fix an MDI queueing bug

Incoming MDI commands now get queued by emcTaskPlan(), if Task and the
interpreter are not ready to process them just yet.

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