Added side queue for MDI commands
Added side queue for MDI commands

If execution of MDI command is active don't interpret subsequent
commands but store them in mdi_execute_queue. On errors flush it.
Now commands sequences like G38.2 Z-2 F10 && G0 Z[#5063+1] works.

Signed-off-by: Pavel Shramov <3ef1cc3de20bab82e628becf930531f94b337ec7@lebu.psha.org.ru>

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